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| 1. | [ adjective ] being one more than twenty | |
| Synonyms: | twenty-one xxi | |
| Related terms: | cardinal | |
| 2. | [ noun ] (mathematics) the cardinal number that is the sum of twenty and one | |
| Synonyms: | twenty-one XXI | |
| Related terms: | large_integer | |
| Similar spelling: |
2 1 |
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