-ier · suffix1
-ier · suffix2
- French · borrowed from-ier
- Middle English · inherited from-ier
- English today-ier
From Middle English -ier, -iere from verbs ending in -ien + -ere, later extended to form other nouns (e.g. Middle English clothyer, glasiere, lovier, tiliere). Later reinforced by Middle French and modern French -ier, largely in words more recently borrowed from or influenced by French (e.g. cashier, financier, etc.). Doublet of -ar, -ary, -eer, and -yer.
Etymology from Wiktionary, CC BY-SA 4.0.