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One that makes a promise.
promisor(ˌprɒmɪˈsɔː; ˈprɒmɪˌsɔː) or
(Law) contract law a person who makes a promise. Compare promisee
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|Noun||1.||promisor - a person who makes a promise|
communicator - a person who communicates with others
vower - someone who makes a solemn promise to do something or behave in a certain way; "young vowers of eternal love"; "there are many vowers of chastity but few who observe it"