Alacrity means cheerful eagerness and quick readiness to do something. When you respond with alacrity, you're genuinely enthusiastic and willing, jumping at the chance to help or participate.

Picture a student who volunteers with alacrity when the teacher asks who wants to demonstrate a science experiment. Their hand shoots up immediately, and you can see the excitement on their face. That's different from reluctantly raising your hand after a long pause, or volunteering but dragging your feet.

The word captures both speed and spirit. If your mom asks you to help bake cookies and you rush to the kitchen with alacrity, you're moving quickly and you're happy about it. A dog greeting its owner at the door shows pure alacrity: instant action plus genuine joy.

You might hear someone say they “accepted the invitation with alacrity” or “approached the challenge with alacrity.” In both cases, the person didn't hesitate or complain. They seized the opportunity with enthusiasm, ready to dive in and get started right away.