Theorize (verb)

1. To form a theory or theories about something.
2. To engage in speculative thinking or abstract reasoning.

Origin:

Late 17th century: from french théoriser or modern latin theorizare, from greek theōria "contemplation, speculation".

Examples:

1. The scientist theorized that the new discovery could revolutionize the field.
2. The philosopher theorized about the nature of reality.
3. The economist theorized that the new policy would lead to a rise in inflation.
4. The psychologist theorized that the behavior was caused by a specific cognitive process.
5. The historian theorized that the event was a turning point in the country's history.