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add [add 词源字典]: add: [14] Etymologically, add means simply ‘put to’. Its source is Latin addere, a compound verb formed from the prefix ad- ‘to’ and the stem -dere ‘put’ (which is related to English do). Its original meaning in English was simply ‘join one thing to another’; its specific mathematical use did not develop until the early 16th century.
=> do[add etymology, add origin, 英语词源]
assert: assert: [17] Assert comes ultimately from Latin asserere, which meant literally ‘join oneself to something’. It was a compound verb formed from the prefix ad- ‘to’ and serere ‘join’ (source of English series and serial), and it came to take on various metaphorical connotations: if one ‘joined oneself to’ a particular thing, one ‘declared one’s right to’ it, and if one ‘joined oneself to’ a particular point of view, one ‘maintained’ it, or ‘claimed’ it.

The verb was used in both these senses when English acquired it, from the Latin past participial stem assert-, but the former had more or less died out by the end of the 18th century.
=> serial, series
match (v.): "to join one to another" (originally especially in marriage), late 14c., from match (n.2). Meaning "to place (one) in conflict with (another)" is from c. 1400. That of "to pair with a view to fitness" is from 1520s; that of "to be equal to" is from 1590s. Related: Matched; matching.