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deltas

noun
DEL-tuhz/ˈdɛltəz/

1 meaning of deltas

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  1. 1
    noun
    Plural of delta.

    Rising seas threaten the farmland of the world's low-lying deltas.

    The report lists the deltas between this year's budget and last year's, line by line.

    Note

    The plural follows the word into very different fields. Geographers count the world’s river deltas; engineers and analysts list the deltas between two sets of figures, each a change in a quantity, written with the symbol Δ, probably a d for difference. Traders compare the deltas of options, how fast each one’s value moves with the underlying price, and isotope chemists report deltas in their own notation.

deltas is a form of delta

delta, noun: A landform at the mouth of a river, where the river empties into a body of water such as a sea or lake. Full entry

Forms
deltadeltas plural
Spelling
delta → deltas: add -s
Sound
The ending sounds like /z/.

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