Etymology
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alacrity (n.)

"liveliness, briskness," mid-15c., from Latin alacritatem (nominative alacritas) "liveliness, ardor, eagerness," from alacer (genitive alacris) "cheerful, brisk, lively;" a word of uncertain origin. Perhaps cognate with Gothic aljan "zeal," Old English ellen "courage, zeal, strength," Old High German ellian. But de Vaan suggests the root sense is "to wander, roam" and a possible connection with ambulare.

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Definitions of alacrity

alacrity (n.)
liveliness and eagerness;
he accepted with alacrity
Synonyms: briskness / smartness
From wordnet.princeton.edu