| billionth | (adjective) the ordinal number of one billion in counting order | - |
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| eighteenth | (adjective) coming next after the seventeenth in position | Synonyms: 18th |
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| eleventh | (adjective) coming next after the tenth and just before the twelfth in position | Synonyms: 11th |
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| fifteenth | (adjective) coming next after the fourteenth and just before the sixteenth in position | Synonyms: 15th |
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| fourteenth | (adjective) coming next after the thirteenth in position | Synonyms: 14th |
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| millionth | (adjective) the ordinal number of one million in counting order | - |
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| nineteenth | (adjective) coming next after the eighteenth in position | Synonyms: 19th |
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| ninth | (adjective) coming next after the eighth and just before the tenth in position | Synonyms: 9th |
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| nth | (adjective) last or greatest in an indefinitely large series | Synonyms: n-th |
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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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| seventeenth | (adjective) coming next after the sixteenth in position | Synonyms: 17th |
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| seventh | (adjective) coming next after the sixth and just before the eighth in position | Synonyms: 7th |
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| sixteenth | (adjective) coming next after the fifteenth in position | Synonyms: 16th |
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| tenth | (adjective) coming next after the ninth and just before the eleventh in position | Synonyms: 10th |
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| thirteenth | (adjective) coming next after the twelfth in position | Synonyms: 13th |
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| trillionth | (adjective) the ordinal number of one trillion in counting order | - |
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| umpteenth | (adjective) last in an indefinitely numerous series | Synonyms: umptieth, umteenth |
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| umteenth | (adjective) last in an indefinitely numerous series | Synonyms: umpteenth, umptieth |
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