What does alacrity mean?
The definition of alacrity
A*lac”ri*ty, n.
Etym: [L. alacritas, fr. alacer lively, eager, prob. akin to Gr. aljan zeal.]

A cheerful readiness, willingness, or promptitude; joyous activity; briskness; sprightliness; as, the soldiers advanced with alacrity to meet the enemy. I have not that alacrity of spirit, Nor cheer of mind that I was wont to have. Shak.