Dictionary![]() ![]() bis•sex•tilePronunciation: (bī-seks'til, -tīl, bi-), [key] —adj. containing or noting the extra day of leap year: The years 1980 and 1984 were both bissextile. —n. See leap year. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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