boon
1 Americannoun
noun
-
something extremely useful, helpful, or beneficial; a blessing or benefit
the car was a boon to him
-
archaic a favour; request
he asked a boon of the king
adjective
-
close, special, or intimate (in the phrase boon companion )
-
archaic jolly or convivial
Other Word Forms
- boonless adjective
Etymology
Origin of boon1
First recorded in 1150–1200; Middle English bon(e) “praying, a prayer, favor asked for,” from Old Norse bōn “prayer, request, petition”; cognate with Old English bēn
Origin of boon2
First recorded in 1300–50; Middle English bon(e), boun “good, goodly,” from Old French, from Latin bonus “good, expert”
Origin of boon3
First recorded in 1350–1400; Middle English (north) bun(n)e, bone “reed, stem, husk (of flax)”; compare Old English bune “reed; drinking cup”
Explanation
Boon means something beneficial to a specific person, entity, or cause. "Getting called out of school on the day of the test was a boon for Sam, as he hadn't remembered to study." Boon derives from the Old Norse bón, a request for a favor. Think of a boon as a favor that no one has necessarily asked for, something extra. "We'd just spent our last dollar on a cup of coffee so it was a real boon to find a ten dollar bill lying on the sidewalk." Boon can also be an adjective for someone friendly and welcoming, as in "a boon companion."
Vocabulary lists containing boon
100 SAT Words Beginning with "B"
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Mythology
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Beowulf vocabulary
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
A global rush to add renewable energy as oil-and-gas prices rise is a boon for the country that dominates green-technology manufacturing.
From The Wall Street Journal • Apr. 16, 2026
Okta stock surged Thursday after a Raymond James said the growing use of artificial intelligence agents will be a boon for the software company.
From Barron's • Apr. 16, 2026
Lower costs have been a boon to the industry.
From Barron's • Apr. 10, 2026
Bianco, echoing independent pollsters as well as political strategists in both parties, said having “Riverside County Sheriff” next to his name on the official state ballot will be a major boon to his campaign.
From Los Angeles Times • Apr. 10, 2026
"My lady, I beg the boon of championing your cause."
From "A Game of Thrones" by George R.R. Martin
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
