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| pen·tad [ pén tàd ] (plural pen·tads) |
noun |
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| Definition: |
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1. group of five: any group or series of five, e.g. in mathematics
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2. chemistry atom with valence of five: an atom or chemical group with a valence of five
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3. meteorology 5 days: in meteorology, a period of five days
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| [Mid-17th century. < Greek pentad-< penta- "five"] |
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