interval - (n.): the period of time between two events, activities etc.

• Synonyms: break, pause, delay, gap in time, intermission, space
• Origin: 1300, from Latin intervallum, originally meaning "space between palisades or ramparts," from inter- meaning "between" + vallum meaning "rampart." (click on rampart to see what one looks like...)
• Example: The MET busses run at regular intervals.

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