A period of time between two events; or the distance between two points, notes, or things.
From Latin *intervallum* “space between palisades, gap between walls,” from *inter-* “between” and *vallum* “rampart, wall.” It shifted from physical gaps to time gaps in later use.
An interval is the “empty” space that secretly shapes the whole pattern—between heartbeats, musical notes, or study sessions. Change the interval, and you often change the feeling or outcome completely.
Complete word intelligence in one call. Free tier — 50 lookups/day.