address (n.) Look up address at Dictionary.com
1530s, "dutiful or courteous approach," from address (v.) and from French adresse. Sense of "formal speech" is from 1751. Sense of "superscription of a letter" is from 1712 and led to the meaning "place of residence" (1888).
addressee (n.) Look up addressee at Dictionary.com
1810; see address (v.) + -ee.
adduce (v.) Look up adduce at Dictionary.com
early 15c., from Latin adducere "lead to, bring to, bring along," from ad- "to" (see ad-) + ducere "to lead" (see duke (n.)). Related: Adduced; adducing.
Adelaide Look up Adelaide at Dictionary.com
fem. proper name, from French Adélaide, from a Germanic source similar to Old High German Adalhaid, from adal "noble family" (see atheling) + German heit "state, rank," related to Old English -had "person, degree, state, nature" (see -hood). The first element affixed to French fem. ending -ine gave Adeline.
Adeline Look up Adeline at Dictionary.com
fem. proper name, from French, of Germanic origin, literally "noble" (see Adelaide).
Adelphia Look up Adelphia at Dictionary.com
district of London, so called because it was laid out by four brothers of a family named Adam, from Greek adelphos "brother," literally "from the same womb," from copulative prefix a- "together with" + delphys "womb," which is perhaps related to dolphin. The district was the site of a popular theater c. 1882-1900, which gave its name to a style of performance.
Aden Look up Aden at Dictionary.com
place in southern Arabia, ultimately from Akkadian edinnu "plain," which some think also is the root of Biblical Eden.
adenine (n.) Look up adenine at Dictionary.com
crystaline base, 1885, coined by German physiologist/chemist Albrecht Kossel (1853-1927) from Greek aden "gland" (see inguinal) + chemical suffix -ine (2). So called because it was derived from the pancreas of an ox.
adenoid (adj.) Look up adenoid at Dictionary.com
1839, "gland-like," medical Latin adenoideus, from Greek adenoeides, from aden (genitive adenos) "gland" (see inguinal) + eidos "form" (see -oid). Adenoids "adenoid growths" attested by 1856.
adenoidal (adj.) Look up adenoidal at Dictionary.com
1852, from adenoid (gland) (see adenoid) + -al (1).
adept (adj.) Look up adept at Dictionary.com
1690s, "completely skilled" from Latin adeptus "having reached, attained," past participle of adipisci "to come up with, arrive at," figuratively "to attain to, acquire," from ad- "to" (see ad-) + apisci "grasp, attain," related to aptus "fitted" (see apt). Related: Adeptly.
adept (n.) Look up adept at Dictionary.com
"an expert," especially "one who is skilled in the secrets of anything," 1660s, from Latin adeptus (see adept (adj.)). The Latin adjective was used as a noun in this sense in Medieval Latin among alchemists.
adequate (adj.) Look up adequate at Dictionary.com
1610s, from Latin adaequatus "equalized," past participle of adaequare "to make equal to," from ad- "to" (see ad-) + aequare "make level," from aequus (see equal (adj.)). The sense is of being "equal to what is required." Related: Adequateness.
adequately (adv.) Look up adequately at Dictionary.com
1620s, from adequate + -ly (2); originally a term in logic in reference to correspondence of ideas and objects. Meaning "suitably" is recorded from 1680s.
adhere (v.) Look up adhere at Dictionary.com
1590s, from Middle French adhérer (15c.) or directly from Latin adhaerare "to stick to" (see adherent (adj.)). Originally often of persons, "to cleave to a leader, cause, party, etc." (compare adherent (n.), which still often retains this sense). Related: Adhered; adhering.
adherence (n.) Look up adherence at Dictionary.com
mid-15c., "attachment to a person, support," from Middle French adhérence, from Latin adhaerentia, noun of action from adhaerentem (nominative adhaerens), present participle of adhaerare (see adherent (adj.)).
adherent (adj.) Look up adherent at Dictionary.com
late 14c., from Old French adherent or directly from Latin adhaerentem (nominative adhaerens), present participle of adhaerere "stick to," from ad- "to" (see ad-) + haerere "to stick" (see hesitation).
adherent (n.) Look up adherent at Dictionary.com
"follower, associate, supporter," early 15c., from Old French adherent or directly from Latin adhaerentem (see adherent (adj.)). Meaning "adhesive substance" is from 1912.
adhesion (n.) Look up adhesion at Dictionary.com
1620s, from French adhésion or directly from Latin adhaesionem (nominative adhaesio) "a sticking to," noun of action from past participle stem of adhaerare (see adherent (adj.)).
Adhesion is generally used in the material, and adherence in the metaphysical sense. [Johnson]
adhesive (adj.) Look up adhesive at Dictionary.com
1660s, from French adhésif, formed in French from Latin adhaes-, past participle stem of adhaere (see adherent (adj.)).
adhesive (n.) Look up adhesive at Dictionary.com
1881, from adhesive (adj.). Originally of postage stamps (adhesive stamp is attested from 1840). Of substances that cause to adhere by 1900.
adiabatic (adj.) Look up adiabatic at Dictionary.com
1838, from Greek adiabatos "not to be passed through," from a- "not" + dia "through" (see dia-) + batos "passable," from bainein "to go" (see come).
adieu Look up adieu at Dictionary.com
late 14c., adewe, from French adieu, from phrase a dieu (vous) commant "I commend (you) to God," from a "to" (see ad) + dieu "God," from Latin deum, accusative of deus "god," from PIE *deiwos (see Zeus). Originally said to the party left; farewell was to the party setting forth.
adios Look up adios at Dictionary.com
1837, American English, from Spanish adios, from phrase a dios vos acomiendo "I commend you to God" (see adieu).
adipose (adj.) Look up adipose at Dictionary.com
1743, from Modern Latin adiposus "fatty," from Latin adipem (nominative adeps, genitive adipis) "soft fat of animals, fat, lard," from Greek aleipha "unguent, fat," related to lipos "grease, fat" (see leave (v.)). Change of -l- to -d- "prob. due to Umbrian influence" [Klein]. But it could as well be a native Italic formation from the same roots, *ad-leip-a "sticking onto."
Adirondack (adj.) Look up Adirondack at Dictionary.com
1906, in reference to a type of lawn or deck chair said to have been designed in 1903 by a Thomas Lee, owner of the Westport Mountain Spring, a resort in the Adirondack region of New York State, and commercially manufactured the following year, but said originally to have been called Westport chair after the town where it was first made. Adirondack Mountains is a back-formation from Adirondacks, treated as a plural noun but really from Mohawk (Iroquoian) adiro:daks "tree-eaters," a name applied to neighboring Algonquian tribes, in which the -s is an imperfective affix.
adit (n.) Look up adit at Dictionary.com
"entrance," c. 1600, from Latin aditus "approach, entrance, a going to or drawing near," from past participle stem of adire "to approach," from ad- "to" (see ad-) + ire "to go," from PIE root *ei- (1) "to go" (see ion).
adjacent (adj.) Look up adjacent at Dictionary.com
early 15c., from Latin adiacentem (nominative adiacens) "lying at," present participle of adiacere "lie at, border upon, lie near," from ad- "to" (see ad-) + iacere "to lie, rest," literally "to throw" (see jet (v.)), with notion of "to cast (oneself) down."
adjectival (adj.) Look up adjectival at Dictionary.com
1797, from adjective + -al (1).
adjective Look up adjective at Dictionary.com
late 14c., as an adjective, "adjectival," in noun adjective, from Old French adjectif (14c.), from Latin adjectivum "that is added to (the noun)," neuter of adjectivus "added," from past participle of adicere "to throw or place (a thing) near," from ad- "to" (see ad-) + comb. form of iacere "to throw" (see jet (v.)). Also as a noun from late 14c. In 19c. Britain, the word itself often was a euphemism for the taboo adjective bloody.
They ... slept until it was cool enough to go out with their 'Towny,' whose vocabulary contained less than six hundred words, and the Adjective. [Kipling, "Soldiers Three," 1888]
adjoin (v.) Look up adjoin at Dictionary.com
c. 1300, "unite, ally" from Old French ajoin- stem of ajoindre "join together, unite," from Latin adiungere "fasten on, harness, join to," from ad- "to" (see ad-) + iungere "to bind together" (see jugular). Meaning "be contiguous with, be adjacent to" is from late 14c. Related: Adjoined; adjoining.
adjourn (v.) Look up adjourn at Dictionary.com
early 14c., ajournen, "assign a day" (for convening or reconvening), from Old French ajourner (12c.) "meet" (at an appointed time), from the phrase à jorn "to a stated day" (à "to" + journ "day," from Latin diurnus "daily;" see diurnal).

The sense is to set a date for a re-meeting. Meaning "to close a meeting" (with or without intention to reconvene) is from early 15c. Meaning "to go in a body to another place" (1640s) is colloquial. The -d- was added 16c. but is unwarranted, as the compound is not from Latin. Related: Adjourned; adjourning.
adjournment (n.) Look up adjournment at Dictionary.com
mid-15c., from Old French ajornement "daybreak, dawn; summons (to appear in court)," from ajorner (see adjourn).
adjudge (v.) Look up adjudge at Dictionary.com
late 14c., "to make a judicial decision," from Old French ajugier "to judge, pass judgment on," from Latin adiudicare "grant or award as a judge," from ad- "to" (see ad-) + iudicare "to judge," which is related to iudicem (see judge (v.)). Sense of "have an opinion" is from c. 1400. Related: Adjudged; adjudging.
adjudicate (v.) Look up adjudicate at Dictionary.com
1700, from Latin adiudicatus, past participle of adiudicare (see adjudge). Related: Adjudicated; adjudicating.
adjudication (n.) Look up adjudication at Dictionary.com
1690s, from French adjudication or directly from Late Latin adiudicationem (nominative adiudicatio), noun of action from past participle stem of adiudicare (see adjudge).
adjudicative (adj.) Look up adjudicative at Dictionary.com
1809; see adjudicate + -ive. Perhaps modeled on French adjudicatif.
adjudicator (n.) Look up adjudicator at Dictionary.com
1804, agent noun in Latin form from adjudicate.
adjunct (n.) Look up adjunct at Dictionary.com
1580s, from Latin adiunctus "closely connected, joined, united" (as a noun, "a characteristic, essential attribute"), past participle of adiungere "join to" (see adjoin).
adjunct (adj.) Look up adjunct at Dictionary.com
1590s, from Latin adiunctus "closely connected, joined, united," past participle of adiungere "join to" (see adjoin). Adjunct professor is 1826, American English.
adjuration (n.) Look up adjuration at Dictionary.com
late 14c., "exorcism," from Late Latin adjurationem (nominative adjuratio) "a swearing to," noun of action from past participle stem of adjurare (see adjure). Originally a term in exorcism (with conjuration). General sense is from 17c.
adjure (v.) Look up adjure at Dictionary.com
late 14c., "to bind by oath; to question under oath," from Latin adiurare "confirm by oath, add an oath, to swear to in addition," in Late Latin "to put (someone) to an oath," from ad- "to" (see ad-) + iurare "swear," from ius (genitive iuris) "law" (see jurist). Related: Adjured; adjuring.
adjust (v.) Look up adjust at Dictionary.com
late 14c., ajusten, "to correct, remedy;" reborrowed by c. 1600 in sense "arrange, settle, compose," from Middle French adjuster, Old French ajouter "to join" (12c.), from Late Latin adiuxtare "to bring near," from Latin ad- "to" (see ad-) + iuxta "next," related to iungere "to join" (see jugular).

Influenced by folk etymology derivation from Latin iustus "just, equitable, fair." Meaning "to arrange (something) so as to conform with (a standard or another thing)" is from 1660s. Insurance sense is from 1755. Meaning "to get used to" first recorded 1924. Related: Adjusted; adjusting.
adjustable (adj.) Look up adjustable at Dictionary.com
1775, from adjust + -able. Related: Adjustably; adjustability.
adjuster (n.) Look up adjuster at Dictionary.com
1670s, agent noun in English form from adjust. Insurance sense is from 1830.
adjustment (n.) Look up adjustment at Dictionary.com
1640s, from French ajustement or else a native formation from adjust (v.) + -ment.
adjustor (n.) Look up adjustor at Dictionary.com
1857, of certain muscles, agent noun in Latin form from adjust (v.).
adjutant (n.) Look up adjutant at Dictionary.com
"military officer who assists superior officers," c. 1600, from Latin adiutantem (nominative adiutans), present participle of adiutare "to give help to, help zealously, serve," frequentative of adiuvare (past participle adiutus) "help, assist, aid, support," from ad- "to" (see ad-) + iuvare "to help, give strength, support," perhaps from same root as iuvenis "young person" (see young).
administer (v.) Look up administer at Dictionary.com
late 14c., administren, aministren "to manage as a steward," from Old French amenistrer "help, aid, be of service to" (12c., Modern French administrer, the -d- restored 16c.), and directly from Latin administrare "to help, assist; manage, control, guide, superintend; rule, direct," from ad- "to" (see ad-) + ministrare "serve" (see minister (v.)). Used of medicine, etc., "to give," from 1540s. Related: Administered; administering.
administrate (v.) Look up administrate at Dictionary.com
1630s, from Latin administratus, past participle of administrare (see administer). In modern use a back-formation from administration. Related: Administrated; administrating.