plural deltas
1
: the 4th letter of the Greek alphabet see Alphabet Table
2
: something shaped like a capital Greek delta
3
mathematics
: an increment of a variable
—symbol Δ
4
: delta wave
During deep sleep, the brain operates in delta wave frequency. But it's difficult to go from beta to theta then delta without first switching down to a relaxed alpha state.—Daily Mail (London)
5
or less commonly Delta
: delta variant
As SARS-CoV-2 continues to spread among humans, natural selection and adaptation will result in more variants that could plausibly be more transmissible than delta.—Suresh V. Kuchipudi
chemistry
: fourth in position in the structure of an organic (see organic entry 1 sense 1b(2)) molecule from a particular group or atom
—symbol δ
Delta
3 of 4communications code word
—used as a code word for the letter d
: of, relating to, or characteristic of the The Delta region of Mississippi
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Merriam-Webster unabridged
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