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



    BrE BrE//ˈdeltə//
    ; NAmE NAmE//ˈdeltə//
    Rivers and lakes
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  1. 1 the fourth letter of the Greek alphabet (Δ, δ)
  2. 2an area of land, shaped like a triangle, where a river has split into several smaller rivers before entering the sea the Nile Delta See related entries: Rivers and lakes
  3. 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.