acceleration (n.) Look up acceleration at Dictionary.com
1530s, from Latin accelerationem (nominative acceleratio) "a hastening," noun of action from past participle stem of accelerare "to hasten, quicken" (see accelerate).
accelerator (n.) Look up accelerator at Dictionary.com
1610s, from Latin accelerator, agent noun from accelerare (see accelerate). Motor vehicle sense is from 1900.
accent (n.) Look up accent at Dictionary.com
late 14c., "particular mode of pronunciation," from Middle French accent, from Old French acent (13c.), from Latin accentus "song added to speech," from ad- "to" (see ad-) + cantus "a singing," past participle of canere "to sing" (see chant (v.)). Loan-translation of Greek prosoidia, from pros- "to" + oide "song," which apparently described the pitch scheme in Greek verse. The decorating sense of "something that emphasizes or highlights" is from 1972.
accent (v.) Look up accent at Dictionary.com
"to pronounce with accent or stress," 1520s, from Middle French accenter, from Old French acenter, from acent (see accent (n.)). Related: Accented; accenting.
accentuate (v.) Look up accentuate at Dictionary.com
1731, from Medieval Latin accentuatus, past participle of accentuare "to accent," from Latin accentus (see accent (n.)). Originally "to pronounce with an accent;" meaning "emphasize" is recorded from 1865.
You've got to accentuate the positive
Eliminate the negative
Latch on to the affirmative
Don't mess with Mister In-Between

["Ac-Cent-Tchu-Ate the Positive," 1944, music by Harold Arlen, lyrics by Johnny Mercer]
Related: Accentuated; accentuating.
accentuation (n.) Look up accentuation at Dictionary.com
1690s, from Medieval Latin accentuationem (nominative accentuatio) "intoning, chanting," noun of action from past participle stem of accentuare (see accentuate).
accept (v.) Look up accept at Dictionary.com
late 14c., "to take what is offered," from Old French accepter (14c.) or directly from Latin acceptare "take or receive willingly," frequentative of accipere "receive," from ad- "to" (see ad-) + capere "to take" (see capable). Related: Accepted; accepting.
acceptability (n.) Look up acceptability at Dictionary.com
1660s, from Late Latin acceptabilitas, from Latin acceptabilis "worthy of acceptance" (see acceptable).
acceptable (adj.) Look up acceptable at Dictionary.com
late 14c., from Old French acceptable, from Latin acceptabilis "worthy of acceptance," from acceptare "take or receive willingly" (see accept). Related: Acceptably.
acceptance (n.) Look up acceptance at Dictionary.com
1570s, from Middle French acceptance, from accepter (see accept). Earlier in same sense was acceptation (late 14c.).
access (n.) Look up access at Dictionary.com
early 14c., "an attack of fever," from Old French acces "onslaught, attack; onset (of an illness)" (14c.), from Latin accessus "a coming to, an approach," noun use of past participle of accedere "to approach" (see accede). The later senses are directly from Latin. Meaning "an entrance" is from c.1600. Meaning "habit or power of getting into the presence of (someone or something)" is from late 14c.
access (v.) Look up access at Dictionary.com
1962, originally in computing, from access (n.). Related: Accessed; accessing.
accessibility (n.) Look up accessibility at Dictionary.com
c.1800, from accessible + -ity.
accessible (adj.) Look up accessible at Dictionary.com
c.1400, "affording access," from Middle French accessible, from Late Latin accessibilis, verbal adjective from Latin accessus "a coming near, approach" (see access (n.)). Meaning "easy to reach" is from 1640s; Of art or writing, "able to be readily understood," 1961 (a term not needed in the years before writing or art often deliberately was made not so).
accession (n.) Look up accession at Dictionary.com
"act of coming to a position," especially of a throne, 1640s, from Latin accessionem (nominative accessio) "a going to, joining, increase," noun of action from past participle stem of accedere "approach, enter upon" (see accede).
accessorize (v.) Look up accessorize at Dictionary.com
1939, from accessory + -ize. Related: Accessorized; accessorizing.
accessory (n.) Look up accessory at Dictionary.com
also accessary, early 15c. as a legal term in the criminal sense of "one aiding in a crime;" also "that which is subordinate to something else," from Late Latin accessorius, from accessor, agent noun from accedere "to approach" (see accede). Attested from 1896 as "woman's smaller articles of dress;" hence accessorize.
accessory (adj.) Look up accessory at Dictionary.com
1550s, "subordinate," from Late Latin accessorius, from accessor, agent noun from accedere "to approach" (see accede). Meaning "aiding in crime" is from c.1600.
accidence (n.) Look up accidence at Dictionary.com
late 14c., in philosophy, "non-essential or incidental characteristic," also "part of grammar dealing with inflection" (mid-15c.), in some cases a misspelling of accidents, or else directly from Latin accidentia (used as a term in grammar by Quintilian), neuter plural of accidens, present participle of accidere (see accident). The grammar sense is because they change in accordance with use.
accident (n.) Look up accident at Dictionary.com
late 14c., "an occurrence, incident, event," from Old French accident (12c.), from Latin accidentem (nominative accidens), present participle of accidere "happen, fall out, fall upon," from ad- "to" (see ad-) + cadere "fall" (see case (n.1)). Meaning grew from "something that happens, an event," to "something that happens by chance," then "mishap." Philosophical sense "non-essential characteristic of a thing" is late 14c. Meaning "unplanned child" is attested by 1932.
accidental (adj.) Look up accidental at Dictionary.com
late 14c., "non-essential," from Old French accidentel or directly from Medieval Latin accidentalis, from Latin accidentem (see accident). Meaning "outside the normal course of nature" is from early 15c.; that of "coming by chance" is from 1570s.
accidental (n.) Look up accidental at Dictionary.com
late 14c., "non-essential quality," from accidental (adj.). The musical sense is from 1868.
accidentally (adv.) Look up accidentally at Dictionary.com
late 14c., "non-essentially," also "unnaturally," from accidental + -ly (2). Meaning "unintentionally" is recorded from 1580s; phrase accidentally on purpose is recorded from 1862.
acclaim (n.) Look up acclaim at Dictionary.com
"act of acclaiming," 1667 (in Milton), from acclaim (v.).
acclaim (v.) Look up acclaim at Dictionary.com
early 14c., "to lay claim to," from Latin acclamare "to cry out at" (see acclamation); the meaning "to applaud" is recorded by 1630s. Related: Acclaimed; acclaiming.
acclamation (n.) Look up acclamation at Dictionary.com
1540s, from Latin acclamationem (nominative acclamatio) "a calling, exclamation, shout of approval," noun of action from past participle stem of acclamare "shout approval or disapproval of, cry out at," from ad- "toward" (see ad-) + clamare "cry out" (see claim (v.)). As a method of voting en masse, by 1801, probably from the French Revolution.
acclimate (v.) Look up acclimate at Dictionary.com
1792, from French acclimater, verb formed from à "to" (see ad-) + climat (see climate). Related: Acclimated; acclimating. The extended form acclimatize is now more common.
acclimation (n.) Look up acclimation at Dictionary.com
1826, noun of action from acclimate.
acclimatize (v.) Look up acclimatize at Dictionary.com
1836; see acclimate + -ize; a more recent formation than acclimate and replacing it in many uses. Related: Acclimatized; acclimatizing.
acclivity (n.) Look up acclivity at Dictionary.com
1610s, from Latin acclivitatem (nominative acclivitas) "an ascending direction, an upward steepness," from acclivis "mounting upwards, ascending," from ad- "up" (see ad-) + clivus "hill, a slope," from PIE *klei-wo-, suffixed form of *klei- "to lean" (see lean (v.)).
accolade (n.) Look up accolade at Dictionary.com
1620s, from French accolade (16c.), from Provençal acolada or Italian accollata, ultimately from noun use of a fem. past participle from Vulgar Latin *accollare "to embrace around the neck," from Latin ad- "to" (see ad-) + collum "neck" (see collar (n.)).

The original sense is of an embrace about the neck or the tapping of a sword on the shoulders to confer knighthood. Extended meaning "praise, award" is from 1852. Also see -ade. Earlier was accoll (mid-14c.), from Old French acolee "an embrace, kiss, especially that given to a new-made knight," from verb acoler. The French noun in the 16c. was transformed to accolade, with the foreign suffix.
accommodate (v.) Look up accommodate at Dictionary.com
1530s, from Latin accomodatus "suitable," past participle of accomodare "make fit, adapt, fit one thing to another," from ad- "to" (see ad-) + commodare "make fit," from commodus "fit" (see commode). Related: Accommodated; accommodating.
accommodating (adj.) Look up accommodating at Dictionary.com
"obliging," 1771, present participle adjective from accommodate.
accommodation (n.) Look up accommodation at Dictionary.com
"room and provisions, lodging," c.1600, now usually plural (accommodations) and chiefly U.S.; from French accommodation, from Latin accommodationem (nominative accommodatio), noun of action from past participle stem of accommodare (see accommodate). Meaning "appliance, anything which affords aid" is from 1610s; that of "act of accommodating" is from 1640s.
accommodations (n.) Look up accommodations at Dictionary.com
"lodgings and entertainment," see accommodation.
accompaniment (n.) Look up accompaniment at Dictionary.com
1744, from French accompagnement (13c.), from accompagner (see accompany). Musical sense is earliest.
accompanist (n.) Look up accompanist at Dictionary.com
"performer who takes the accompanying part in music," 1833, from accompany + -ist. Fowler prefers accompanyist.
accompany (v.) Look up accompany at Dictionary.com
early 15c., "to be in company with," from Middle French accompagner, from Old French acompaignier (12c.) "take as a companion," from à "to" (see ad-) + compaignier, from compaign (see companion). Related: Accompanied; accompanying.
accomplice (n.) Look up accomplice at Dictionary.com
1580s (earlier complice, late 15c.), from Old French complice "a confederate," from Late Latin complicem (nominative complex) "partner, confederate," from Latin complicare "fold together" (see complicate). With parasitic a- on model of accomplish, etc., or perhaps by assimilation of indefinite article in phrase a complice.
accomplish (v.) Look up accomplish at Dictionary.com
late 14c., from Old French acompliss-, present participle stem of acomplir "to fulfill, fill up, complete" (12c.), from Vulgar Latin *accomplere, from Latin ad- "to" (see ad-) + complere "fill up" (see complete (adj.)). Related: Accomplished; accomplishing.
accomplished (adj.) Look up accomplished at Dictionary.com
late 15c., "perfect as a result of training," past participle adjective from accomplish (v.). Meaning "completed" is from late 14c.
accomplishment (n.) Look up accomplishment at Dictionary.com
early 15c., "performance of a task; state of completion," from Old French acomplissement "action of accomplishing," from acomplir (see accomplish). Meaning "thing completed" and that of "something that completes" someone and fits him or her for society are from c.1600.
accord (v.) Look up accord at Dictionary.com
early 12c., from Old French acorder (12c.) "reconcile, agree, be in harmony," from Vulgar Latin *accordare "make agree," literally "be of one heart, bring heart to heart," from Latin ad- "to" (see ad-) + cor (genitive cordis) "heart" (see heart). Related: Accorded; according.
accord (n.) Look up accord at Dictionary.com
late 13c., accourd, from Old French acord "agreement," a back-formation from acorder (see accord (v.)).
accordance (n.) Look up accordance at Dictionary.com
c.1300, "compliance;" early 14c., "agreement, concurrence," from Old French acordance "agreeing, reconciliation, harmony," noun of action from acorder (see accord). Of things, "conformity, compatibility, harmony," late 14c. Phrase in accordance with is attested from c.1810 (in Middle English, in accordance of was the usual form).
according Look up according at Dictionary.com
c.1300, "matching, similar, correponding," present participle adjective and adverb from accord (v.). Meanings "conforming (to), compliant, in agreement; consistent, harmonious; suitable, appropriate" are from late 14c. According to "referring to," literally "in a manner agreeing with" is attested from mid-15c.
accordingly (adv.) Look up accordingly at Dictionary.com
mid-14c., "in agreement with," from according + -ly (2). From mid-15c. as "properly; adequately;" meaning "in agreement with logic or expectation" is recorded 1680s.
accordion (n.) Look up accordion at Dictionary.com
1831, from German Akkordion, from Akkord "musical chord, concord of sounds, be in tune" (compare Italian accordare "to attune an instrument"); ultimately from same source as English accord (v.), with suffix on analogy of clarion, etc. Invented 1829 by piano-maker Cyrill Demian (1772-1847) of Vienna.
accost (v.) Look up accost at Dictionary.com
1570s, from Middle French accoster "move up to," from Italian accostare or directly from Late Latin accostare "come up to the side," from Latin ad- "to" (see ad-) + costa "rib, side" (see coast (n.)). The original notion is of fleets of warships attacking an enemy's coast. Related: Accosted; accosting.
accouchement (n.) Look up accouchement at Dictionary.com
1803, from French accouchement, noun of action from accoucher (see accoucheur).