delta

del-ta · noun

imported

Definitions

noun

  1. 1.

    The fourth letter of the Greek alphabet (uppercase: triangle shape, lowercase: resembles d).

  2. 2.

    A triangular area of land where a river divides before entering a larger body of water.

  3. 3.

    (mathematics, science) A symbol representing change or difference.

  4. 4.

    (NATO alphabet) Code word for the letter D.

Related words

See also: alphabet, change, river
Synonyms: change, difference, estuary, river mouth

Etymology

From Greek delta, the fourth letter of the Greek alphabet. The geographical sense arose because the triangular shape of river deltas resembles the uppercase Greek letter (a triangle). Used in English since the 16th century.