ENGLISH THESAURUS & DICTIONARY

A

noun

Words like A

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29 words · nounSort by

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antiophthalmic factor

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axerophthol

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damp

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deoxyadenosine monophosphate

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Related words aren’t always interchangeable. Check the definition before you choose.

MEANING & USAGE

Definitions & examples

01noun

a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

02noun

any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

03noun

nucleotide derived from adenine with a deoxyribose sugar and a phosphate group

04noun

(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

4 more meanings

05noun

the basic unit of electric current adopted under the Systeme International d'Unites

“a typical household circuit carries 15 to 50 amps”

06noun

the 1st letter of the Roman alphabet

07noun

the blood group whose red cells carry the A antigen

08noun

the 1st letter of the Roman alphabet

Meanings and examples from Open English WordNet 2025. About our sources ↗

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Expressions with “A”

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Explore multiword dictionary entries containing this word. Each has its own meanings and related words.

a bit a few a lot many a to a T type A A level group A