Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “A, a”

A, a

noun uk   // (plural As, A's or a's) us  

A, a noun (LETTER)

[C or U] the first letter of the English alphabetLetters of alphabetsLettering and alphabets

A, a noun (MUSIC)

[C or U] a note in Western music: This concerto is in the key of A major.Notes of the musical scale

A, a noun (MARK)

[C or U] a mark in an exam or for a piece of work that shows that your work is considered excellent: Sophie got (an) A for English. She got straight As (= all her marks were As) in her end-of-year exams.US Jim is a straight-A student (= all his marks are A).Marks and results

A, a noun (ELECTRICITY)

written abbreviation for ampUnits of electrical power
(Definition of A, a from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of A, a?
Browse related topics

You are looking at an entry to do with Complete and whole, but you might be interested in these topics from the Full and empty topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “A, a” in other dictionaries

Word of the Day

hoppy

like hops (= dried fruit used to make beer)

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More