Noah Webster's Dictionary 1. (n.) A thought, imagination, or conjecture, which is based upon feeble or scanty evidence; suspicion; guess; as, the surmisses of jealousy or of envy. 2. (n.) Reflection; thought. 3. (v. t.) To imagine without certain knowledge; to infer on slight grounds; to suppose, conjecture, or suspect; to guess.

Multi-Version Concordance Surmise (1 Occurrence) Acts 27:27 But when the fourteenth night had come, as we were driven back and forth in the Adriatic Sea, about midnight the sailors surmised that they were drawing near to some land. (Root in WEB ASV NAS)