conjecture

From Wiktionary

Pronunciation[change]

Noun[change]

Singular
conjecture

Plural
conjectures

  1. (formal) A conjecture is a statement or an idea which has not be proven.

Verb[change]

Plain form
conjecture

Third-person singular
conjectures

Past tense
conjectured

Past participle
conjectured

Present participle
conjecturing

  1. (transitive & intransitive) (formal) If you conjecture an idea, you guess or put it forward.
    I'm not sure, but I would conjecture that she must have had a key to open it.