Mid 19th century (earlier (Middle English) as juxtaposition ): from French juxtaposer, from Latin juxta ‘next’ + French poser ‘to place’.
juxta
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Latin iuxta ‘beside, very near, close to, near at hand’ is a contraction of *iugista (adv.), superlative of adjective *iugos ‘closely connected,’ from PIE root *yeug- ‘to join’.
Early 17th century (in the senses ‘harmonize discrepancies’ and ‘assess loss or damages’): from obsolete French adjuster, from Old French ajoster ‘to approximate’, based on Latin ad– ‘to’ + juxta ‘near’.