the GNU version of the Collaborative International Dictionary of English
n. One who promises.
The Century Dictionary and Cyclopedia
n. One who promises; one who engages, assures, stipulates, or covenants: in legal use promisor.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a person who makes a promise
Word Usage
"If the trust of the promiser is the ground of the moral obligation to keep a promise, then prior to the promisee coming to trust the promiser, no such obligation exists."