Real Dictionary

-a in American English 1
suffix: a plural ending of nouns borrowed from Greek and Latin

-a in American English 2
suffix: a feminine singular ending of nouns borrowed from Latin and Greek, also used in Neo-Latin coinages to Latinize bases of any origin, and as a Latin substitute for the feminine ending -ē of Greek words

-a in American English 3
suffix: an ending of personal names forming feminines from masculines

-a in American English 4
suffix: a suffix designating the oxide of the chemical element denoted by the stem

A
A or a is used as an abbreviation for words beginning with a, such as 'acceleration', 'ampère', or 'answer'.
determiner: You use a or an when you are referring to any person or thing of a particular type and do not want to be specific.
determiner: You use a or an when you are referring to someone or something for the first time or when people may not know which particular person or thing you are talking about.
variable noun: A is the first letter of the English alphabet.
variable noun: If you get an A as a mark for a piece of work or in an exam, your work is extremely good.
variable noun: In music, A is the sixth note in the scale of C major.

A in American English
noun: the first letter of the English alphabet, a vowel
symbol
symbol: angstrom

A in American English 1
a blood type
not any particular or certain one of a class or group
the first letter of the English alphabet: from the Greek alpha, a borrowing from the Phoenician
abbreviation: ampere; amperes

A in American English 2
absolute
one; one sort of
preposition: each; every; per
symbol: the first in order or in a series

a in American English 3
all
preposition: a reduced, unstressed form of of (often written as part of a single, unhyphenated word)

a in American English 4
about
auxiliary verb: a reduced, unstressed form of auxiliary have following some modals, as might, should, could, would, and must (usually written as part of a single, unhyphenated word)

a in American English 5
pronoun: he

a in American English 6
symbol: are; ares

a in American English 7
symbol

a in American English 8
abbreviation: about

a in British English
noun: the first letter and first vowel of the modern English alphabet
symbol for: a note having a frequency of 440 hertz (A above middle C) or this value multiplied or divided by any power of 2; the sixth note of the scale of C major
symbol for: angstrom unit

a in British English 1
used preceding a singular countable noun, if the noun is not previously specified or known

a in British English 2
verb

a in British English 3
preposition

a in British English 4
symbol for: acceleration

a-
prefix: A- is added to the beginning of some adjectives in order to form adjectives that describe someone or something that does not have the feature or quality indicated by the original word.

A- in American English
combining form: atomic

a- in American English 1
in, into, on, at, to
prefix: a reduced form of the Old English preposition on, meaning “on,” “in,” “into,” “to,” “ toward,” preserved before a noun in a prepositional phrase, forming a predicate adjective or an adverbial element ( afoot; abed; ashore; aside; away), or before an adjec

a- in American English 2
up, out: now generally used as an intensive
prefix: a reduced form of the Old English preposition of

a- in American English 3
prefix: an old point-action prefix, not referring to an act as a whole, but only to the beginning or end, as She arose (rose up) or They abided by their beliefs (remained faithful to the end)

a- in American English 4
prefix: var. of ab- before p and v

a- in American English 5
prefix: var. of ad- used: (1) before sc, sp, st (ascend) and (2) in words of French derivation (often with the sense of increase, addition)

a- in American English 6
prefix: var. of an-1 before a consonant, meaning “not,” “without”

a- in British English 1
prefix: not; without; opposite to

a- in British English 2
prefix: on; in; towards

A. in American English
abbreviation: Absolute

A. in British English
abbreviation for: acre(s) or acreage

a' in American English
adjective: all

a' in British English
determiner