delta1
n.
- the fourth letter of the Greek alphabet (Δ, δ), transliterated as ‘d’.
▸
[as modifier]
denoting the fourth in a series of items or categories.
▸Brit. a fourth-class mark given for a piece of work.
- a code word representing the letter D, used in radio communication.
symb.
Mathematics variation of a variable or quantity.
Etymology
Gk, from Phoenician daleth.
delta2
n.
a triangular tract of sediment deposited at the mouth of a river, typically where it diverges into several outlets.
Derivative
Etymology
C16: orig. the Delta (of the River Nile), from the shape of the Gk letter (see delta1).
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