| billionth | (adjective) the ordinal number of one billion in counting order | - |
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| bimonthly | (adjective) occurring every two months | Synonyms: bimestrial |
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| (adjective) occurring twice a month | Synonyms: semimonthly |
| millionth | (adjective) the ordinal number of one million in counting order | - |
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| monthlong | (adjective) last through a month | - |
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| monthly | (adjective) of or occurring or payable every month | - |
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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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| quintillionth | (adjective) the ordinal number of one quintillion in counting order | - |
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| semimonthly | (adjective) occurring twice a month | Synonyms: bimonthly |
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| trillionth | (adjective) the ordinal number of one trillion in counting order | - |
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