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Definition of delta noun from the Oxford Advanced Learner's Dictionary

delta

noun
 
/ˈdeltə/
 
/ˈdeltə/
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  1. [countable] the fourth letter of the Greek alphabet (Δ, δ)
  2. [countable] an area of land, like a triangle in shape, where a river has split into several smaller rivers before entering the sea
    • the Nile Delta
    Topics Geographyc2
  3. Delta
     [uncountable] a variant (= form) of the SARS-CoV-2 virus that was first reported in late 2020 and named ‘Delta’ in 2021. It became the main form of the virus worldwide until the Omicron variant appeared in late 2021.
    • The Delta variant proved to be more transmissible than earlier variants of the virus.
    Topics Health problemsc2
    4. Word Originsense 1 Greek, from Phoenician daleth.sense 2 mid 16th cent.: originally specifically as the Delta (of the River Nile), from the shape of the Greek letter.
See delta in the Oxford Advanced American DictionarySee delta in the Oxford Learner's Dictionary of Academic English
Check pronunciation: delta

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