Real Dictionary

delta
A delta is an area of low, flat land shaped like a triangle, where a river splits and spreads out into several branches before entering the sea.

delta in American English
of, in, or from the Delta
noun: the fourth letter of the Greek alphabet (Δ, δ)
noun: the NATO name for a class of Soviet nuclear-powered ballistic missile submarine armed with 16 multi-warhead missiles

delta in British English
noun: the fourth letter in the Greek alphabet (Δ, δ), a consonant transliterated as d

Delta in British English 1
noun: usually the fourth brightest star in a constellation

Delta in British English 2
noun: a state of Nigeria, on the Niger river delta on the Gulf of Guinea. Capital: Asaba. Pop: 4 098 391 (2006). Area: 17 698 sq km (6833 sq miles)