Englishfor English speakers
interval
Noun
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A distance in space or in time.
There is a ten-minute interval between classes.
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In music, an interval is the difference in pitch between two notes.
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In mathematics, an interval is a connected section of the real line.
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(mostly British) An intermission.
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In the game of cricket, either of the two breaks, at lunch and tea, between the three sessions of a day's play.
boundary
Noun
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A boundary is the line around something's outside edge.
The elephants have to live within the boundary of the park or risk being shot.
There have been many times in their lives when the boundaries between their personal and professional lives have disappeared.
More manufactured goods are crossing international boundaries every day.
An international commission that regulates the boundary waters between the U.S. and Canada.