What term is used for a brief period of time between significant events?

The term “interim” refers to a temporary period between two significant events, situations, or activities. It is often used to describe a time during which something is in a state of flux, or when a new phase is not yet fully established. This can apply in various contexts, such as management when a new leader is not yet in place, or in project planning where a phase is concluded, and a new one is about to begin.

In contrast, while "interlude" typically refers to a break or pause within an ongoing event, it may not emphasize the transitional nature between two significant events as strongly as "interim." "Interval" implies a measurable span of time between two points or activities but does not necessarily indicate a temporary situation, and "transition" refers more to the process of change itself rather than the specific period of time during that change. Therefore, "interim" precisely captures the essence of a brief period between two major occurrences.