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Webster 1913 Edition

Adj.

[Gr. [GREEK], fr. [GREEK] two.]

Pertaining to the number two; of two parts or elements.

Dyadic arithmetic

the same as

binary arithmetic

dyadic ‎(comparative more dyadic, superlative most dyadic)

Pertaining to the number two; of two parts or elements.
Pertaining to the physical sex of a person who is exactly male or female; not intersex.

pertaining to the number two