Alacrity (noun)

Eager and enthusiastic willingness.

Origin:

Late middle english: from old french alacrité, from alacer "lively", from latin alacer "brisk, eager".

Examples:

1. He accepted the invitation with alacrity.
2. The staff approached their tasks with alacrity.
3. She showed alacrity in learning the new software.
4. He completed the work with great alacrity.
5. The team accepted the challenge with alacrity.