N-COUNT
（一種語言的）全部字母，字母表
An alphabet is a set of letters usually presented in a fixed order which is used for writing the words of a particular language or group of languages.
例句
The modern Russian alphabet has 31 letters...
現代俄語字母表有31個字母。
By two and a half he knew the alphabet.
兩歲半時他已認識全部字母。