or gues·ti·mate

[verb ges-tuh-meyt; noun ges-tuh-mit, -meyt]Informal.
See more synonyms for guesstimate on
verb (used with object), guess·ti·mat·ed, guess·ti·mat·ing.
  1. to estimate without substantial basis in facts or statistics.
  1. an estimate arrived at by guesswork.

Origin of guesstimate

1935–40, Americanism; blend of guess and estimate Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for guesstimate



noun (ˈɡɛstɪmɪt)
  1. an estimate calculated mainly or only by guesswork
verb (ˈɡɛstɪˌmeɪt)
  1. to form a guesstimate of
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 guesstimate

1902, a blending of guess (v.) and estimate. Related: Guesstimated; guesstimating. As a noun, from 1906.

Online Etymology Dictionary, © 2010 Douglas Harper