Delta Definition

The fourth letter of the Greek alphabet (Δ, δ)
Webster's New World
An object shaped like a triangle.
American Heritage
Something in the shape of a delta (Δ); specif., a tract of flat land, usually triangular, formed by deposits of soil and sand at the mouth of a large river.
Webster's New World
A similar deposit at the mouth of a tidal inlet, caused by tidal currents.
American Heritage
A finite increment in a variable.
American Heritage
Being in the fourth position relative to a designated carbon atom in an organic molecule at which an atom or a group may be substituted.
American Heritage

Of, in, or from the Delta (see phrase below)

Delta blues.
Webster's New World
Referring to the fourth of a group of isomers, or molecules of similar origin or properties, determined arbitrarily by those who discover or classify them. Used in combination.
American Heritage

See alpha.

Webster's New World

Diploma in English Language Teaching to Adults, an advanced qualification to teach English, higher than the CELTA, accredited by the University of Cambridge.


Other Word Forms of Delta



Idioms, Phrasal Verbs Related to Delta

  • the Delta

Origin of Delta

  • Middle English from Latin from Greek of Phoenician origin dl in Semitic roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek δέλτα (delta).

    From Wiktionary

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