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noun 0.723

leap day

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biennial

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biannual

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common year

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sextile

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biennium

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lunar year

noun 0.542

biweekly

noun 0.540

bisexual

noun 0.537

semiannual

noun 0.534

lunar calendar

noun 0.528

sextic

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intercalary

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bicuspid

noun 0.515

semimonthly

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semi-weekly

noun 0.509

bivalent

noun 0.507

solar calendar

noun 0.505

bisection

noun 0.505

bivoltine

noun 0.503

semiweekly

noun 0.502

sexagesimal

noun 0.500