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   delta

   /ˈdɛltə/

   noun

   • 1. the fourth letter of the Greek alphabet (Δ, δ), transliterated as ‘d’.
   • ▪ a fourth-class mark given for an essay, examination paper, or other piece of work. British
   • ▪ 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"
   • ▪ 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"

   symbol

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

   Word Origin Greek, from Phoenician daleth.

   Scrabble Points: 6

   • D

     2

   • E

     1

   • L

     1

   • T

     1

   • A

     1

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