a
a
determiner
Meaning 'per' or 'each' to express frequency.
"He earns fifty pounds a day."
determiner
Indefinite article used before singular countable nouns.
"I need a pen for this form."
determiner
Refers to any single member of a specific class.
"A dog makes a loyal pet."
determiner
Used before a proper noun to mean 'a certain'.
"There's a Mr Davies waiting for you."
noun
The first letter of the English alphabet.
"The word 'apple' begins with 'a'."
Thesaurus
Synonyms: antiophthalmic factor, vitamin A, axerophthol, ampere, amp, deoxyadenosine monophosphate, group A, type A, angstrom unit, angstrom, adenine