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half-open interval

[haf-oh-puh n, hahf-] /ˈhæfˌoʊ pən, ˈhɑf-/
noun, Mathematics
1.
a set of numbers between two given numbers but including only one endpoint.
Also called half-closed interval [haf-klohzd, hahf-] /ˈhæfˌkloʊzd, ˈhɑf-/ (Show IPA).
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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