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promisor (n.)

"person who makes a promise," 1790, agent noun in Latin form from promise (v.). Apparently restricted to legal use; promiser, the native formation, in the general sense, is from mid-15c. Promisee is from 1733.

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Definitions of promisor from WordNet

promisor (n.)
a person who makes a promise;
Synonyms: promiser
From wordnet.princeton.edu