| billionth | (adjective) the ordinal number of one billion in counting order | - |
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| (noun) one part in a billion equal parts | Synonyms: one-billionth |
| (noun) position 1,000,000,000 in a countable series of things | - |
| bimonthly | (adjective) occurring every two months | Synonyms: bimestrial |
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| (adjective) occurring twice a month | Synonyms: semimonthly |
| (noun) a periodical that is published twice a month or every two months (either 24 or 6 issues per year) | - |
| (adverb) every two months | - |
| (adverb) twice a month | Synonyms: semimonthly |
| millionth | (adjective) the ordinal number of one million in counting order | - |
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| (noun) one part in a million equal parts | Synonyms: one-millionth |
| (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 |
| monthlong | (adjective) last through a month | - |
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| monthly | (adjective) of or occurring or payable every month | - |
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| (noun) a periodical that is published every month (or 12 issues per year) | - |
| (adverb) occurring once a month | - |
| monthsary | (noun) the one month anniversary of something | - |
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| nonthermal | (adjective) not involving heat | - |
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| quadrillionth | (adjective) the ordinal number of one quadrillion in counting order | - |
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| (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
| quintillionth | (adjective) the ordinal number of one quintillion in counting order | - |
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| (noun) one part in a quintillion equal parts | Synonyms: one-quintillionth |
| semimonthly | (adjective) occurring twice a month | Synonyms: bimonthly |
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| (noun) a periodical that is published twice each month (or 24 issues per year) | - |
| (adverb) twice a month | Synonyms: bimonthly |
| trillionth | (adjective) the ordinal number of one trillion in counting order | - |
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| (noun) one part in a trillion equal parts | Synonyms: one-trillionth |
| twelvemonth | (noun) a period of time containing 365 (or 366) days | Synonyms: year, yr |
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