LATIN DICTIONARYLexicon Latīnum
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“boon” in Latin

The English word boon itself goes back to Latin duonus, through bonus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

boon
gratia, beneficium, donum, munus. SYN., in GIFT.
boon adj.
hilaris, laetus, jocosus, jucundus. Boon-companion, combibo; compotor; sodalis.

Quick answer

What is the Latin word for boon?
The usual Latin words for “boon” are grātia, beneficium, dōnum; also mūnus, hilaris, laetus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.