Entry 1 sense Webster, 1913 Fastening /făs'-ən-ĭng/ · Fas·ten·ing · IPA /ˈfɑːsənɪŋ/ 01 n. Anything that binds and makes fast, as a lock, catch, bolt, bar, buckle, etc. 1. Anything that binds and makes fast, as a lock, catch, bolt, bar, buckle, etc.