noun
- cheerful readiness, promptness, or willingness: We accepted the invitation with alacrity.
- liveliness; briskness.
noun
- liveliness or briskness
mid-15c., from Latin alacritatem (nominative alacritas) “liveliness, ardor, eagerness,” from alacer (genitive alacris) “cheerful, brisk, lively;” of uncertain origin, perhaps cognate with Gothic aljan “zeal,” Old English ellen “courage, zeal, strength,” Old High German ellian.