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promisor

[prom-uh-sawr, prom-uh-sawr]
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noun Law.
  1. a person who makes a promise.
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Origin of promisor

First recorded in 1840–50; promise + -or2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for promisor

promisor

noun
  1. contract law a person who makes a promiseCompare promisee
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for promisor

n.

1790, agent noun in Latin form from promise (v.). Apparently restricted to legal use.

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Online Etymology Dictionary, © 2010 Douglas Harper