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conjugal: conjugal: [16] The notion underlying conjugal is of ‘joining together’. It comes from Latin conjugālis, an adjective derived from conjux ‘spouse’. This is turn was derived from conjugāre ‘join together (in marriage)’, a compound verb formed from the prefix com- ‘together’ and jugāre ‘yoke’ (a derivative of jugum ‘yoke’, which is related to English yoke and yoga). (The grammatical connotations of English conjugate [16] arise from the notion of a ‘connected’ set of verb forms.) The base of jugum, *jug-, also produced jungere ‘join’, whose derivative conjungere ‘join together’ is responsible for the parallel set of English words conjoin [14], conjunct [15], and conjunction [14].
=> conjugate, conjunction, join, yoga, yoke
subjugate: subjugate: see yoke
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.
subjugable (adj.): 1850, from stem of Latin subiugare (see subjugation) + -able.
subjugate (v.): early 15c., a back-formation from subjugation or else from Latin subiugatus, past participle of subiugare "to subjugate." Related: Subjugated; subjugating.
subjugation (n.): late 14c., from Late Latin subiugationem (nominative subiugatio), noun of action from past participle stem of Latin subiugare "to subdue," literally "bring under the yoke," from sub "under" (see sub-) + iugum (see jugular).
subjugator (n.): 1795, agent noun in Latin form from subjugate.