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1. Oxford American Dictionary

   delta

   • IPA[ˈdeltə]

   美式

   • n.
     the fourth letter of the Greek alphabet (Δ, δ), transliterated as ‘d’.；the fourth in a series of items, categories, etc.
   • symbol
     variation of a variable or function.；a finite increment.

   • noun: delta, plural noun: deltas

2. • 釋義

   n.

   名詞

   • 1. the fourth letter of the Greek alphabet (Δ, δ), transliterated as ‘d’.
   • ▪ the fourth in a series of items, categories, etc. delta hepatitis
   • ▪ the fourth (usually fourth brightest) star in a constellation Delta Cephei
   • 2. a code word representing the letter D, used in radio communication.
   • 3. a difference between two things or values there's a delta between perception and reality as long as the price delta is not too great, consumers can be sold on specs and future-proofing
   • ▪ a change or set of changes made to a file or program, especially as part of an update to a later version this approach saves disk space by storing only data deltas updates will be delivered as delta updates instead of complete application downloads

   symbol

   symbol

   • 1. variation of a variable or function.
   • 2. a finite increment.
   • 3. the discriminant of a quadratic equation.
   • 4. declination.