1. Happily; gladly: I would fain improve every opportunity to wonder and worship, as a sunflower welcomes the light (Henry David Thoreau). 2.Archaic Preferably; rather.
ADJECTIVE:
Archaic1. Ready; willing. 2. Pleased; happy. 3. Obliged or required.
ETYMOLOGY:
Middle English, from Old English fægen, joyful, glad.