delta1 Syllabification: (del·ta)Pronunciation: /ˈdeltə/Translate delta | into German | into Italian | into Spanish Definition of delta noun 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 (Delta) [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. symbol (δ) Mathematics variation of a variable or function. (Δ) Mathematics a finite increment. (δ) Astronomy declination. delta in other Oxford dictionaries Definition of delta in the British & World English dictionary
