|1.||the fourth letter in the Greek alphabet (Δ, δ), a consonant transliterated as d|
|2.||an object resembling a capital delta in shape|
|3.||(capital when part of name) the flat alluvial area at the mouth of some rivers where the mainstream splits up into several distributaries: the Mississippi Delta|
|4.||maths a finite increment in a variable|
|[C16: via Latin from Greek, of Semitic origin; compare Hebrew dāleth]|
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