A

A.

noun. The first letter of the English alphabet

From A to B. from one place to another

From A to Z. including everything

A, a note in western music

A, a mark in an exam or a piece of work that your work is considered excellent

A, the abbreviation for amp electricity

Not particular
1. used before a single noun to mean something or someone that the readers or listeners don't necessarily know which one you are referring to

2. to mean anyone of the type of the things

3. to mean what type of thing or person you want to say

4. used before some uncountable nouns to limit the meaning in some way

5. used before some nouns of action

6. used before a container or unit especially something you drink or eat

7. used before the first but not the second of two nouns

8. used before a person's name or a family's name

9. used before the name of a day or month

10. used before some words which express a number or amount

A, one