What is the Latin word for "time" that Cicero often references?

The Latin word "tempus" is indeed the correct term for "time" that Cicero frequently uses in his writings. This word encompasses various meanings related to time, such as a specific moment, a period, or even an era, and is foundational in Latin literature and philosophical texts. Cicero, being a prominent statesman and philosopher, often engaged with themes related to time in his discussions of duty, ethics, and the human condition.

Other options, while they may pertain to the concept of time, do not hold the same direct significance or frequency of use in Cicero’s works. For example, "spatium" generally refers to a space or interval, "momentus" conveys the idea of a moment but is not a standard term like "tempus," and "era" refers more to a significant period or epoch rather than time in a general sense. Thus, "tempus" stands out as the most appropriate and commonly used term by Cicero in the context of discussing time.