D defs.my
Entry 1 sense Webster, 1913

Celerity

/səl-ĕr'-ət-ē/ · Ce·ler·i·ty · IPA /səˈlɛr.ɪ.ti/
01 n. Rapidity of motion; quickness; swiftness.
  1. 1.
    Rapidity of motion; quickness; swiftness.
    “Time, with all its celerity, moves slowly to him whose whole employment is to watch its flight.” Johnson.