How do you spell Conjecture

Available Definitions:
1)  n. - An opinion, or judgment, formed on defective or presumptive evidence; probable inference; surmise; guess; suspicion.
2)  v. t. - To arrive at by conjecture; to infer on slight evidence; to surmise; to guess; to form, at random, opinions concerning.
3)  v. i. - To make conjectures; to surmise; to guess; to infer; to form an opinion; to imagine.