delta: Meaning and Definition of

del•ta

1. the fourth letter of the Greek alphabet (&Dgr;, &dgr;).
2. the consonant sound represented by this letter.
3. the fourth in a series of items.
4. anything triangular, like the Greek capital delta (&Dgr;).
5. an incremental change in a variable, as &Dgr; or &dgr;.
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.)a star that is usually the fourth brightest of a constellation: The fourth brightest star in the Southern Cross is Delta Crucis.

Del•ta

1. the NATO name for a class of Soviet nuclear-powered ballistic missile submarine armed with 16 multi-warhead missiles.