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subinterval

[suhb-in-ter-vuh l] /sʌbˈɪn tər vəl/
noun, Mathematics.
1.
an interval that is a subset of a given interval.
Origin of subinterval
1925-1930
First recorded in 1925-30; sub- + interval
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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