The story
- Middle English · inherited from-arie
- English today-ary
Inherited from Middle English -arie, a back-formation from Latin and French-borrowed adjectives ending respectively in -ārius and -aire (more rarely from Latin adjectives in -āris: see exemplary and lapidary). Doublet of -ar, -eer, -ier, and -yer; see also the related -arian.
Etymology from Wiktionary, CC BY-SA 4.0.