surmise UK /sɜːˈmaɪz/US /sɚˈmaɪz/noun 2verb 1forms 3 noun2 •Thought, imagination, or conjecture, which may be based upon feeble or scanty evidence; suspicion; guess.This opinion, however, is merely a surmise, which may or may not be the case. •Reflection; thought; posit.My Thought, whose Murther yet is but fantasticall, / Shakes so my single state of Man, / That Function is smother'd in surmise, / And nothing is, but what is not. — 1606 verb1 •To imagine or suspect; to conjecture; to posit with contestable premises.If, as I surmise, you see the ladies this evening, you might mention my intended visit. formssurmised · surmising · surmises