Del·ta n.; pl. Deltas
 1. The fourth letter of the Greek alphabet (Δ δ), corresponding to D. Hence, an object having the shape of the capital Δ.
 2. A tract of land shaped like the letter delta (Δ), especially when the land is alluvial and inclosed between two or more mouths of a river; as, the delta of the Ganges, of the Nile, or of the Mississippi.
 3.  Elec. The closed figure produced by connecting three coils or circuits successively, end for end, esp. in a three-phase system; -- often used attributively, as delta winding, delta connection (which see), etc.

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