| twelve | the cardinal number that is the sum of eleven and one |
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| twelve | denoting a quantity consisting of 12 items or units |
| twelve | the middle of the day |
| twelve | twelve kin groups of ancient Israel each traditionally descended from one of the twelve sons of Jacob |
| twelve | a type of serial music introduced by Arnold Schoenberg |
| twelve | a type of serial music introduced by Arnold Schoenberg |
| twelve | a period of time containing 365 (or 366) days |