Meaning of “speculate” - Learner’s Dictionary

speculate

verb [ I, T ] uk us /ˈspekjəleɪt/

to guess possible answers to a question when you do not have enough information to be certain:

The police refused to speculate about the cause of the accident.
[ + that ] The newspapers have speculated that they will get married next year.

(Definition of “speculate” from the Cambridge Learner’s Dictionary © Cambridge University Press)