equal (adj.) Look up equal at Dictionary.com
late 14c., "identical in amount, extent, or portion;" early 15c., "even or smooth of surface," from Latin aequalis "uniform, identical, equal," from aequus "level, even, flat; as tall as, on a level with; friendly, kind, just, fair, equitable, impartial; proportionate; calm, tranquil," of unknown origin. Parallel formation egal (from Old French egal) was in use late 14c.-17c. Equal rights is from 1752; by 1854, American English, in relation to men and women. Equal opportunity (adj.) in terms of hiring, etc. is recorded by 1925.
equal (v.) Look up equal at Dictionary.com
1580s, "compare, liken, consider as equal" (obsolete), also "match, rival, become equal to," from equal (adj.). Related: Equaled; equaling.
equal (n.) Look up equal at Dictionary.com
1570s, from equal (adj.).