delta.
The fourth letter of the modern Greek alphabet Δ, δ.
Meaning & usage
The fourth letter of the modern Greek alphabet Δ, δ.
A landform at the mouth of a river where it empties into a body of water.
Nile Delta
Alternative letter-case form of Delta from the NATO/ICAO Phonetic Alphabet.
The symbol Δ; A change in a quantity, likely from "d" for "difference".
ΔV - "delta vee"(change in velocity, used in rocketry and orbital mechanics)
The rate of change in an option value with respect to the underlying asset's price.
A value in delta notation indicating the relative abundances of isotopes.
The set of differences between two versions of a file.
When you update the file, the system will only save the deltas.
A small but noticeable effect. Compare epsilon.
This will slow the main code path down, but only by delta.
The angle subtended at the center of a circular arc.
A type of cargo bike that has one wheel in front and two in back.
The closed figure produced by connecting three coils or circuits successively, end for end, especially in a three-phase system.
delta winding; delta connection; delta current
A military unit, nominally headed by a colonel, equivalent to a USAF operations wing, or an army regiment.
a star that is usually the fourth brightest of a constellation.
one of four baryons consisting of up and down quarks with a combined spin of 3/2: Δ⁺⁺ (uuu), Δ⁺ (uud), Δ⁰ (udd), or Δ⁻ (ddd)
Ellipsis of delta variant (variant of the SARS-CoV-2 virus).
Where this word comes from
From Ancient Greek δέλτα (délta), borrowed from a Phoenician word for "door", ultimately from Proto-Semitic *dalt-. Doublet of dalet. * (river): from the triangular shape of the majuscule Greek letter delta Δ * (USSF): from the delta wing, symbol of the USSF, a triangular wing, shaped like the majuscule Greek letter delta Δ
To calculate the differences between the characters in an enciphered text and the characters a fixed number of positions previous.
To compare two versions of the same file in order to determine where they differ (where a programmer has made edits).
Where this word comes from
From Ancient Greek δέλτα (délta), borrowed from a Phoenician word for "door", ultimately from Proto-Semitic *dalt-. Doublet of dalet. * (river): from the triangular shape of the majuscule Greek letter delta Δ * (USSF): from the delta wing, symbol of the USSF, a triangular wing, shaped like the majuscule Greek letter delta Δ
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.