'conjecture' originates from Latin, specifically the word 'coniectura,' where 'con-' meant 'together' and 'iacere' meant 'to throw.'

'coniectura' transformed into the Old French word 'conjecture,' and eventually became the modern English word 'conjecture' through Middle English.

Initially, it meant 'to throw together ideas or opinions,' and over time it evolved into its current meaning of 'to form an opinion or supposition about something on the basis of incomplete information.'