Meaning

verb alter or regulate so as to achieve accuracy or conform to a standard

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

verb adapt or conform oneself to new or different conditions

originFrom Middle English ajusten, borrowed from Middle French adjuster, or Old French, from Latin ad (“to, up to, towards”) + iustus (“correct, proper, exact”); Equivalent to ad- + just. Probably influenced in sense by Old French ajouster (cf. modern ajouter), from Vulgar Latin *adiuxtāre, from Latin iuxta. The Middle English originally meant "to correct, remedy" in the late 14th century, and was…

Etymology from Wiktionary, CC BY-SA 3.0