Meaning

verb place in a line or arrange so as to be parallel or straight

verb be or come into adjustment with

verb align oneself with a group or a way of thinking

originFrom Middle English alynen, alinen (“copulate”), from Middle French aligner, from Old French alignier, from a- + lignier, from Latin lineare (“make straight or perpendicular”), from the noun linea (“line”), from līneus (“flaxen; flaxen [thing]”), from līnum (“flax”), likely ultimately from Proto-Indo-European *līnom (compare linen).

Etymology from Wiktionary, CC BY-SA 3.0