UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈbuːn/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/bun/ ,USA pronunciation: respelling(bo̅o̅n)

WordReference Random House Learner's Dictionary of American English © 2020
boon1 /bun/USA pronunciation   n. [countable;  usually singular]
  1. something to be thankful for;
    a blessing;
    benefit:The lower fares are a boon to senior citizens.
  2. something that is asked for;
    a favor.

WordReference Random House Unabridged Dictionary of American English © 2020
boon1  (bo̅o̅n),USA pronunciation n. 
  1. something to be thankful for;
  2. something that is asked;
    a favor sought.
boonless, adj. 
  • Old Norse bōn prayer; cognate with Old English bēn
  • Middle English bone 1125–75

boon2  (bo̅o̅n),USA pronunciation adj. 
  1. jolly;
    convivial:boon companions.
  2. [Archaic.]kindly;
  • Latin bonus good
  • Middle French
  • Middle English bone 1275–1325

boon3  (bo̅o̅n),USA pronunciation n. [Textiles.]
  1. Textilesthe ligneous waste product obtained by braking and scutching flax. Also called  shive, shove. 
  • 1350–1400; Middle English (north) bone; compare Old English bune reed

Collins Concise English Dictionary © HarperCollins Publishers::
boon /buːn/ n
  1. something extremely useful, helpful, or beneficial; a blessing or benefit: the car was a boon to him
Etymology: 12th Century: from Old Norse bōn request; related to Old English bēn prayer
boon /buːn/ adj
  1. close, special, or intimate (in the phrase boon companion)
  2. archaic jolly or convivial
Etymology: 14th Century: from Old French bon from Latin bonus good
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