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1the fourth letter of the Greek alphabet (Δ, δ), transliterated as ‘d.’. [as modifier] the fourth in a series of items, categories, etc.:delta hepatitis
) [followed by Latin genitive] Astronomy the fourth (usually fourth-brightest) star in a constellation:Delta Cephei
2a code word representing the letter D, used in radio communication.
(δ) Mathematics variation of a variable or function. (Δ) Mathematics a finite increment. (δ) Astronomy declination.