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associate (adj.)

early 15c., "allied, connected, paired; joined in an interest, object, employment or purpose," from Latin associatus, past participle of associare "join with," from assimilated form of ad "to" (see ad-) + sociare "unite with," from socius "companion, ally," from PIE *sokw-yo-, suffixed form of root *sekw- (1) "to follow."

associate (n.)

1530s, "a partner in interest or business," from associate (adj.). Meaning "one admitted to a subordinate degree of membership" is from 1812.

associate (v.)

mid-15c., "join in company, combine intimately" (transitive), from Latin associatus past participle of associare "join with," from assimilated form of ad "to" (see ad-) + sociare "unite with," from socius "companion, ally," from PIE *sokw-yo-, suffixed form of root *sekw- (1) "to follow." Related: Associated; associating. Intransitive sense of "have intercourse, be associated" is from 1640s. Earlier form of the verb was associen (late 14c.), from Old French associier "associate (with)."