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."

Definitions of boon
  1. noun
    a desirable state
    “a spanking breeze is a boon to sailors”
    synonyms: blessing
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    something for which to be thankful
    type of:
    good fortune, good luck, luckiness
    an auspicious state resulting from favorable outcomes
  2. adjective
    very close and convivial
    boon companions”
    close in relevance or relationship
Word Family