- jolly; jovial; convivial: boon companions.
- Archaic. kindly; gracious; bounteous.
- Australian derogatory a young working-class person from Canberra
- something extremely useful, helpful, or beneficial; a blessing or benefitthe car was a boon to him
- archaic a favour; requesthe asked a boon of the king
- close, special, or intimate (in the phrase boon companion)
- archaic jolly or convivial
late 12c., bone “petition,” from Old Norse bon “a petition, prayer,” from Proto-Germanic *boniz (cf. Old English ben “prayer, petition,” bannan “to summon;” see ).
in boon companion (1560s), only real survival of Middle English boon “good” (early 14c.), from Old French bon (see ).