cheerful readiness, promptness, or willingness:
We accepted the invitation with alacrity.
liveliness; briskness.
Historical Examples

Before him every hat was doffed with alacritous esteem due to his age and worth.
Household stories from the Land of Hofer R. H. Busk

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.

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