subinterval

[ suhb-in-ter-vuh l ]
/ sʌbˈɪn tər vəl /

noun Mathematics.

an interval that is a subset of a given interval.

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Origin of subinterval

First recorded in 1925–30; sub- + interval
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020