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conjoin (v.)[conjoin 词源字典]: late 14c., from Old French conjoindre "meet, come together" (12c.), from Latin coniungere "to join together," from com- "together" (see com-) + iungere "join" (see jugular). Related: Conjoined, conjoining.[conjoin etymology, conjoin origin, 英语词源]
conjoint (adj.): late 14c., from Middle French conjoint, past participle of conjoindre (see conjoin). Related: Conjointly (early 14c.).
conjugal (adj.): 1540s, from Middle French conjugal (13c.), from Latin coniugalis "relating to marriage," from coniunx (genitive coniugis) "spouse," related to coniugare "to join together," from com- "together" (see com-) + iugare "to join," from iugum "yoke" (see jugular).
conjugate (v.): 1520s, in grammatical sense; 1560s in literal sense, from Latin coniugatus, past participle of coniugare "to yoke together" (see conjugal). Earlier as an adjective (late 15c.). Related: Conjugated; conjugating.
conjugation (n.): mid-15c., from Latin conjugationem (nominative conjugatio) "a combining, connecting," noun of action from conjugare "to join together" (see conjugal). Grammatical sense is 1520s.
conjunct (adj.): mid-15c., from Latin coniunctus, past participle of coniugare (see conjugal). A doublet of conjoint.
conjunction (n.): late 14c., originally of planets, from Old French conjonction "union, joining, sexual intercourse" (12c.), from Latin coniunctionem (nominative coniunctio), from past participle stem of coniugare "join together" (see conjugal). Compare Italian congiunzione, Spanish conjunción. Grammatical sense (late 14c.) was in Latin, a loan-translation of Greek syndesmos. The word also had the meaning "sexual union" 17c.-18c.
conjunctiva (n.): 1540s, medical Latin, short for membrana conjunctiva "conjunctive membrane" (see conjunctive).
conjunctive (adj.): late 15c., from Latin coniunctivus "serving to connect," from coniunctus, past participle of coniungere (see conjoin). Grammatical sense is from 1660s.
conjunctivitis (n.): 1835, inflammation of the conjunctiva; from conjunctiva + -itis "inflammation."
conjuncture (n.): c. 1600, from French conjoncture (16c.), from Modern Latin *conjunctura, from Latin coniunctus (see conjunct).
conjuration (n.): late 14c., coniuracioun, "conspiracy" (now obsolete), also "a calling upon something supernatural," from Old French conjuracion "spell, incantation, formula used in exorcism," from Latin coniurationem (nominative coniuratio) "a swearing together, conspiracy," noun of action from coniurare (see conjure).
conjure (v.): late 13c., "command on oath," from Old French conjurer "invoke, conjure" (12c.), from Latin coniurare "to swear together; conspire," from com- "together" (see com-) + iurare "to swear" (see jury (n.)). Magical sense is c. 1300, for "constraining by spell" a demon to do one's bidding. Related: Conjured; conjuring. Phrase conjure up "cause to appear in the mind" (as if by magic) attested from 1580s.
conjurer (n.): late 14c., from Anglo-French conjurour, Old French conjureur "conjurer, magician, exorcist," from Latin coniurator, from coniurare (see conjure).
conk (v.): as in conk out, 1918, coined by World War I airmen, perhaps in imitation of the sound of a stalling motor, reinforced by conk (v.) "hit on the head," originally "punch in the nose" (1821), from conk (n.), slang for "nose" (1812), perhaps from fancied resemblance to a conch (pronounced "conk") shell.
conker (n.): "snail shell," also "horse chestnut," from children's game of conkers (q.v.).
conkers (n.): "child's game played with horse chestnuts," originally with snail shells, 1847, probably a variant of conquer. The goal was to break the other player's item by hitting it with yours.
conlang (n.): by 1991, from constructed language.
connate (adj.): 1640s, from Late Latin connatus "born together, twins," past participle of connasci "to be born together," from com- "together" (see com-) + nasci "to be born" (Old Latin gnasci; see genus). Related: Connation.
connect (v.): mid-15c., from Latin conectere "join together" (see connection). Displaced 16c. by connex (1540s), from Middle French connexer, from Latin *connexare, a supposed frequentative of conectere (past participle stem connex-). Connect was re-established 1670s.

A similar change took place in French, where connexer was superseded by connecter. Meaning "to establish a relationship" (with) is from 1881. Slang meaning "get in touch with" is attested by 1926, from telephone connections. Meaning "awaken meaningful emotions, establish rapport" is from 1942. Of a hit or blow, "to reach the target," from c. 1920. Related: Connected; connecting; connectedness.