WordReference Random House Learner's Dictionary of American English © 2017
del•ta /ˈdɛltə/USA pronunciation   n.[countable]pl.  -tas. 
  1. Linguisticsthe fourth letter of the Greek alphabet (&Dgr;
    , δ).
  2. anything triangular, like the Greek capital delta (&Dgr;
    ).
  3. Place Namesa flat, triangular area of land with rich soil lying between branches of the mouth of a river.

WordReference Random House Unabridged Dictionary of American English © 2017
del•ta  (deltə),USA pronunciation n. 
  1. the fourth letter of the Greek alphabet (Δ, δ).
  2. the consonant sound represented by this letter.
  3. the fourth in a series of items.
  4. anything triangular, like the Greek capital delta (Δ).
  5. [Math.]an incremental change in a variable, as Δ or δ.
  6. a nearly flat plain of alluvial deposit between diverging branches of the mouth of a river, often, though not necessarily, triangular:the Nile delta.
  7. (usually cap.) a word used in communications to represent the letter D.
  8. (cap.) [Astron.]a star that is usually the fourth brightest of a constellation:The fourth brightest star in the Southern Cross is Delta Crucis.
  • Greek délta; akin to Hebrew dāleth
  • Latin delta
  • Middle English deltha 1350–1400

Del•ta  (deltə),USA pronunciation n. [Mil.]
  1. Militarythe NATO name for a class of Soviet nuclear-powered ballistic missile submarine armed with 16 multi-warhead missiles.


Collins Concise English Dictionary © HarperCollins Publishers::

delta /ˈdɛltə/ n
  1. the fourth letter in the Greek alphabet (Δ, δ), a consonant transliterated as d
  2. (capital when part of name) the flat alluvial area at the mouth of some rivers where the mainstream splits up into several distributaries
  3. a finite increment in a variable
Etymology: 16th Century: via Latin from Greek, of Semitic origin; compare Hebrew dāleth

deltaic /dɛlˈteɪɪk/, ˈdeltic adj



'delta' also found in these entries:
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