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deca-or dec- also deka- or dek-
(Mathematics) denoting ten: decagon. In conjunction with scientific units the symbol da is used
[from Greek deka]
a combining form meaning “ten”: decapod.Also, esp. before a vowel, dec-.
[< Greek deka-, comb. form of déka ten; c. Latin decem]
A prefix that means "ten," as in decahedron, a polygon having ten faces.
Prefix meaning ten in the metric system; e.g., a decameter is a measure of length equal to 10 m.