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1. the fourth letter of the Greek alphabet (Δ, δ). 2. the consonant sound represented by this letter. 3. the fourth in a series of items. 4. anything triangular, like the Greek capital delta (Δ). 5. Mathematics. an incremental change in a variable, as Δ or δ. 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 initial capital letter) a word used in communications to represent the letter D. 8. (initial capital letter) Astronomy. a star that is usually the fourth brightest of a constellation: The fourth brightest star in the Southern Cross is Delta Crucis.

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16y ago

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