Greek alphabet noun2 •The 24-letter alphabet of the Greek language, first adopted by Athens in 403 BC and now consisting of the following upper- (majuscule) and lower-case (minuscule) pairs •(historical) Other (epichoric) forms of this alphabet, both prior and subsequent, sometimes they includevariant letter pairs such as Ϝ ϝ, Ͷ ͷ, Ϛ ϛ, Ͱ ͱ, Ϳ ϳ, Ϻ ϻ, Ϙ ϙ, Ϟ ϟ, Ͳ ͳ, Ϡ ϡ, Ϸ ϸvariant letters such as ℩, ς formsGreek alphabets