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conjoint (adj.)

"united, connected, associated," late 14c., from Middle French conjoint, past participle of conjoindre "to meet, come together" (12c.), from Latin coniungere "to join together," from assimilated form of com "with, together" (see con-) + iungere "to join together" (from nasalized form of PIE root *yeug- "to join." Related: Conjointly (early 14c.).