boon Definition

boon¹
noun

1. An advantage, benefit or blessing; something to be thankful for.

Thesaurus: benefit, blessing, gift, godsend, grant, gratuity, windfall; Antonym: blight, disadvantage.
2. old use
A gift or favour.

Etymology: 12c: from Norse bon a prayer.

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boon²
adj

1. Close, convivial, intimate or favourite.

Example: a boon companion

Etymology: 14c: from French bon good.