conjectātĭo, ōnis, f. [coniecto],
a conjecturing, guessing, conjecture, surmise (post-Aug.; mostly in Plin. the elder; not in Quint.): ingens opum, Plin. 6, 19, 22, § 68: plana de deo, id. 2, 7, 5, § 21: obscura, id. 10, 75, 97, § 209: lubrica atque ambagiosa, Gell. 14, 1, 33.