| billionth | (noun) one part in a billion equal parts | Synonyms: one-billionth |
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| (noun) position 1,000,000,000 in a countable series of things | - |
| bimonthly | (noun) a periodical that is published twice a month or every two months (either 24 or 6 issues per year) | - |
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| millionth | (noun) one part in a million equal parts | Synonyms: one-millionth |
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| (noun) position 1,000,000 in a countable series of things | - |
| month | (noun) a time unit of approximately 30 days | - |
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| (noun) one of the twelve divisions of the calendar year | Synonyms: calendar month |
| monthly | (noun) a periodical that is published every month (or 12 issues per year) | - |
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| monthsary | (noun) the one month anniversary of something | - |
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| quadrillionth | (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
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| quintillionth | (noun) one part in a quintillion equal parts | Synonyms: one-quintillionth |
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| semimonthly | (noun) a periodical that is published twice each month (or 24 issues per year) | - |
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| trillionth | (noun) one part in a trillion equal parts | Synonyms: one-trillionth |
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| twelvemonth | (noun) a period of time containing 365 (or 366) days | Synonyms: year, yr |
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