Pronunciation: (yOO'sij, -zij),[key] —n. 1. a customary way of doing something; a custom or practice: the usages of the last 50 years. 2. the customary manner in which a language or a form of a language is spoken or written: English usage; a grammar based on usage rather than on arbitrary notions of correctness. 3. a particular instance of this: a usage borrowed from French. 4. any manner of doing or handling something; treatment: rough usage. 5. habitual or customary use; long-continued practice: immemorial usage. 6. an act of using or employing; use.