1. Noun
Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds.
2. Adjective
Having the valence of a pentad.
3. Noun
the cardinal number that is the sum of four and one
Vocabulary classified under Mathematics
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