Meaning of guesstimate

guess•ti•mate

Pronunciation: (v.ges'tu-māt"n.ges'tu-mit, -māt"), [key]
— v., n. -mat•ed, -mat•ing,
—v.t.
  1. to estimate without substantial basis in facts or statistics.
—n.
  1. an estimate arrived at by guesswork.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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