Con‐jec″ture (; 135?), n. [L. conjectura, fr. conjicere, conjectum, to throw together, infer, conjecture; con- + jacere to throw: cf. F. conjecturer. See Jet a shooting forth.] An opinion, or judgment, formed on defective or presumptive evidence; probable inference; surmise; guess; suspicion.
He would thus have corrected his first loose conjecture by a real study of nature.
Whewell.
Conjectures, fancies, built on nothing firm.
Milton.