N-COUNT
（一种语言的）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...
现代俄语字母表有31个字母。
By two and a half he knew the alphabet.
两岁半时他已认识全部字母。