equal
adj.
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," which is 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.
v.
1580s, "compare, liken, consider as equal" (obsolete), also "match, rival, become equal to," from equal, adj.. Related: Equaled; equaling.
n.
1570s, from equal, adj..
〔蒋〕[equ相等,-al形容词后缀,…的] 相等的,平等的,相同的
〔李〕[equ=even相等的;-al a.=being有……性质的→“being even相等的”→] a. of the even equlity, value, number, degree, etc.相等的;等值的;等量的