[Word Family: noun: ↑usage, ↑use, ↑disuse, ↑misuse, ↑reuse, ↑usefulness ≠ ↑uselessness, ↑user; adjective: ↑reusable, used ≠ ↑unused, ↑disused, ↑useful ≠ ↑useless, ↑usable ≠ ↑unusable; verb: ↑use, ↑misuse, ↑reuse; adverb: ↑usefully ≠ ↑uselessly]
1. [uncountable and countable] the way that words are used in a language:
a book on modern English usage
2. [uncountable] the way in which something is used, or the amount of it that is used:
Water usage is increasing.