All 5 Uses

boon
in
Incidents in the Life of a Slave Girl
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Of a man who was not my master I could ask to have my children well supported; and in this case, I felt confident I should obtain the boon.†
Chpt 10

boon = something that is of great benefit
Though the boon would have been precious to me, above all price, I would not have taken it at the expense of leaving them in slavery.†
Chpt 16 *
My relatives had been foiled in all their efforts, but God had raised me up a friend among strangers, who had bestowed on me the precious, long-desired boon.†
Chpt 41
It is a privilege to serve her who pities my oppressed people, and who has bestowed the inestimable boon of freedom on me and my children.†
Chpt 41
She was grateful for the boon; but the idea of having been bought was always galling to a spirit that could never acknowledge itself to be a chattel.†
Chpt Appe

Definitions:

(1) (boon)
something that is of great benefit
(2) (meaning too rare to warrant focus)
More rarely, in archaic literature, a boon may refer to a favor or request. It is also a rare spelling of a last name.