late 14c., stacionarie, "having no apparent motion" (in reference to planets), via Anglo-Latin stationarius "motionless," from the stem of statio "a standing, post, job, position" (see station (n.)). The Old French form was stacioonaire. The meaning "unmovable" is from 1620s. In classical Latin, stationarius is recorded only in the sense "of a military station;" the word for "stationary, steady" being statarius.
updated on November 29, 2022