delta

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The fourth letter of the Greek alphabet. See Table at alphabet.
2. n. An object shaped like a triangle.
3. n. A usually triangular alluvial deposit at the mouth of a river.
4. n. A similar deposit at the mouth of a tidal inlet, caused by tidal currents.
5. n. Mathematics A finite increment in a variable.

Century Dictionary and Cyclopedia

1. n. The name of the Greek letter Δ, δ, answering to the Latin and English D. See D.
2. n. A triangular island or alluvial tract included between the diverging branches of the mouth of a great river: as, the delta of the Nile, of the Ganges, of the Mississippi, etc.
3. n. In anatomy, a triangular space or surface.

Wiktionary

1. n. The fourth letter of the modern Greek alphabet Δ, δ.
2. n. A landform at the mouth of a river where it empties into a body of water.
3. n. The letter D in the ICAO spelling alphabet, which assigns words to letters of the alphabet.
4. n. mathematics The symbol Δ.
5. n. computing, informal A small but noticeable effect, compare with epsilon.
6. n. computing The set of differences between two versions of a file.
7. n. surveying The angle subtended at the center of a circular arc.

GNU Webster's 1913

1. n. The fourth letter of the Greek alphabet (Δ δ), corresponding to d. an object having the shape of the capital Δ.
2. n. 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.
3. n. (Elec.) The closed figure produced by connecting three coils or circuits successively, end for end, esp. in a three-phase system; -- often used attributively

WordNet 3.0

1. n. an object shaped like an equilateral triangle
2. n. a low triangular area of alluvial deposits where a river divides before entering a larger body of water
3. n. the 4th letter of the Greek alphabet