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Definition of: delta
(del′tə) noun
1. The fourth letter in the Greek alphabet (Δ, δ): corresponding to English d. As a numeral it denotes 4.
2. Geog. An alluvial, typically triangular-shaped, silt deposit at or in the mouth of a river.
3. Anything triangular.
—del·ta·ic (del·tā′ik) adjective
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