Etymology
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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)."
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associate (n.)
1530s, "a partner in interest or business," from associate (adj.). Meaning "one admitted to a subordinate degree of membership" is from 1812.
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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."
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associative (adj.)
"resulting from association," 1804, from associate (v.) + -ive.
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disassociate (v.)

"dissociate, sever from association," c. 1600, from dis- + associate (v.). Related: Disassociated; disassociating.

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affiliate (n.)
1846, from affiliate (v.) via the adjective. Compare associate (n.). Affiliated society in reference to a local society connected with another or associated with a central organization is from 1795.
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*sekw- (1)

Proto-Indo-European root meaning "to follow."

It forms all or part of: associate; association; consequence; consequent; dissociate; ensue; execute; extrinsic; intrinsic; obsequious; persecute; persecution; prosecute; pursue; second (adj.) "next after first;" second (n.) "one-sixtieth of a minute;" sect; secundine; segue; sequacious; sequel; sequence; sequester; sociable; social; society; socio-; subsequent; sue; suit; suite; suitor; tocsin.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sacate "accompanies, follows;" Avestan hacaiti, Greek hepesthai "to follow;" Latin sequi "to follow, come after," secundus "second, the following;" Lithuanian seku, sekti "to follow;" Old Irish sechim "I follow."

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social (n.)
"friendly gathering," 1870, from social (adj.). In late 17c. it meant "a companion, associate."
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wench (v.)
"to associate with common women," 1590s, from wench (n.). Related: Wenched; wencher; wenching.
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consort (v.)

"associate, unite in company," 1580s, from consort (n.). Related: Consorted; consorting. Since the earliest record it has been confused in form and sense with concert.

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