delta

plural deltas

1. The fourth letter of the modern Greek alphabet Δ, δ.
2. A landform at the mouth of a river where it empties into a body of water.

   Nile Delta

3. international standardsAlternative letter-case form of Delta from the NATO/ICAO Phonetic Alphabet.
4. engineeringThe symbol Δ; A change in a quantity, likely from "d" for "difference".

   ΔV - "delta vee"(change in velocity, used in rocketry and orbital mechanics)

5. businessThe rate of change in an option value with respect to the underlying asset's price.
6. chemistryA value in delta notation indicating the relative abundances of isotopes.
7. computingThe set of differences between two versions of a file.

   When you update the file, the system will only save the deltas.

8. informalcomputingA small but noticeable effect. Compare epsilon.

   This will slow the main code path down, but only by delta.

9. geographyThe angle subtended at the center of a circular arc.
10. A type of cargo bike that has one wheel in front and two in back.
11. attributiveoftenbusinessThe 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

12. Space ForceUSgovernmentA military unit, nominally headed by a colonel, equivalent to a USAF operations wing, or an army regiment.

    Synonyms: garrison

13. astronomya star that is usually the fourth brightest of a constellation.
14. natural sciencesone 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)
15. abbreviationellipsismedicineEllipsis of delta variant (variant of the SARS-CoV-2 virus).

present singular third person deltas · participle present deltaing · participle past deltaed · past deltaed

1. computingTo calculate the differences between the characters in an enciphered text and the characters a fixed number of positions previous.

   Turingery worked on deltaed key to produce the deltaed contribution of the chi-wheels. Turing's discovery that delta-ing would reveal information otherwise hidden was essential to the developments that followed.

   2007, B. J. Copeland, “Tunny and Colossus: Breaking the Lorenz Schlüsselzusatz traffic”, in Karl de Leeuw, Jan Bergstra, editors, The History of Information Security: A Comprehensive Handbook, Amsterdam: Elsevier, →ISBN, page 458

2. computingTo compare two versions of the same file in order to determine where they differ (where a programmer has made edits).

   The primary function of this command is to delta the product version file (if it has been retrieved for edit). However, prior to deltaing the product version file, the work source tree is searched to verify that no other source files are still waiting to be deltaed.

   1992, Israel Silverberg, Source File Management With SCCS, Englewood Cliffs, NJ: Prentice Hall, →ISBN, page 166

1. A state of Nigeria in the South South geopolitical zone. Capital: Asaba. Largest city: Warri.
2. A municipality in Central Macedonia, Greece.
3. A municipality of Minas Gerais, Brazil.
4. A municipality of British Columbia, Canada.

   1 more example

   The xʷəxʷilməxʷ (Indigenous Peoples) recognized how the meeting of the təməxʷ (land), stal̓əw̓ (river), and k̓ʷaƛ̓k̓ʷa (sea) could provide an abundance of access to seasonal resources, as well as provide a more permanent residence for the scəw̓aθən məsteyəxʷ (Tsawwassen Peoples). The features of this landscape are part of what makes Delta a beautiful place for all to enjoy today.

   2021 August 8, “Delta, TFN unveil new interpretive sign”, in Delta Optimist

5. A village in Ontario, Canada.
6. A number of places in the United States:
   1. A census-designated place and unincorporated community in Clay County, Alabama.
   2. A city and home rule municipality, the county seat of Delta County, Colorado.
   3. An unincorporated community in Saline County, Illinois.
   4. A city in Keokuk County, Iowa.
   5. An unincorporated community in Wayne County, Kentucky.
   6. A village in Madison Parish, Louisiana.
   7. A city in Cape Girardeau County, Missouri.
   8. An unincorporated community in Stokes County, North Carolina.
   9. A village in Fulton County, Ohio.
   10. A borough in York County, Pennsylvania.
   11. A city in Millard County, Utah.
   12. A town and unincorporated community in Bayfield County, Wisconsin.
   13. A river in Alaska.

1. The Delta variant of COVID-19.

   Delta is moderately resistant to vaccines, particularly in people who have received just a single dose.

   2021 June 22, “Delta coronavirus variant: scientists brace for impact”, in Nature

plural DELTAs

1. abbreviationacronymAcronym of Diploma in Teaching English to Speakers of Other Languages, an advanced qualification to teach English, higher than the CELTA, accredited by the University of Cambridge.