a
1[ uh; when stressed ey ]
/ ə; when stressed eɪ /
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indefinite article
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Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
Origin of a
1First recorded in 1200–50; Middle English; originally preconsonantal phonetic variant of an1
grammar notes for a
In both spoken and written English the choice of a1 or an1 is determined by the initial sound of the word that follows. Before a consonant sound, a is used; before a vowel sound, an : a book, a rose; an apple, an opera. Problems arise occasionally when the following word begins with a vowel letter but actually starts with a consonant sound, or vice versa. Some words beginning with the vowel letter u and all words beginning with the vowel letters eu are pronounced with a beginning consonant sound, as if the first letter were y : a union; a European. Some other spellings that begin with a vowel letter may also stand for an initial consonant sound: a ewe; a ewer. The words one and once and all compounds of which they are the first element begin with a w sound: a one-room apartment; a once-famous actor.
The names of the consonant letters f, h, l, m, n, r, s, and x are pronounced with a beginning vowel sound. When these letters are used as words or to form words, they are preceded by an : to rent an L-shaped studio; to fly an SST. The names of the vowel letter u and the semivowel letters w and y are pronounced with a beginning consonant sound. When used as words, they are preceded by a : a U-turn; The plumber installed a Y in the line.
In some words beginning with the letter h, the h is not pronounced; the words actually begin with a vowel sound: an hour; an honor. When the h is strongly pronounced, as in a stressed syllable at the beginning of a word, it is preceded by a : a history of the Sioux; a hero sandwich. (In former times an was used before strongly pronounced h in a stressed first syllable: an hundred. ) Such adjectives as historic, historical, heroic, and habitual, which begin with an unstressed syllable and often with a silent or weakly pronounced h, are commonly preceded by an, especially in British English. But the use of a rather than an is widespread in both speech and writing: a historical novel; a habitual criminal. Hotel and unique are occasionally preceded by an, but this use is increasingly old-fashioned. Although in some dialects an has yielded to a in all cases, edited writing reflects usage as described above.
The names of the consonant letters f, h, l, m, n, r, s, and x are pronounced with a beginning vowel sound. When these letters are used as words or to form words, they are preceded by an : to rent an L-shaped studio; to fly an SST. The names of the vowel letter u and the semivowel letters w and y are pronounced with a beginning consonant sound. When used as words, they are preceded by a : a U-turn; The plumber installed a Y in the line.
In some words beginning with the letter h, the h is not pronounced; the words actually begin with a vowel sound: an hour; an honor. When the h is strongly pronounced, as in a stressed syllable at the beginning of a word, it is preceded by a : a history of the Sioux; a hero sandwich. (In former times an was used before strongly pronounced h in a stressed first syllable: an hundred. ) Such adjectives as historic, historical, heroic, and habitual, which begin with an unstressed syllable and often with a silent or weakly pronounced h, are commonly preceded by an, especially in British English. But the use of a rather than an is widespread in both speech and writing: a historical novel; a habitual criminal. Hotel and unique are occasionally preceded by an, but this use is increasingly old-fashioned. Although in some dialects an has yielded to a in all cases, edited writing reflects usage as described above.
Words nearby a
Definition for a (2 of 28)
a2
[ uh; when stressed ey ]
/ ə; when stressed eɪ /
preposition
each; every; per: ten cents a sheet; three times a day.
Definition for a (3 of 28)
a3
[ uh ]
/ ə /
preposition
Informal. a reduced, unstressed form of of (often written as part of a single, unhyphenated word): cloth a gold; time a day; kinda; sorta.
Origin of a
3Middle English; unstressed preconsonantal variant of of1
Definition for a (4 of 28)
a4
[ uh ]
/ ə /
auxiliary verb Informal.
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):We shoulda gone.
Compare of2.
Origin of a
4First recorded in 1300–50; Middle English; a phonetic variant of have
Definition for a (5 of 28)
Origin of a
5First recorded in 1200–50; Middle English a, ha
Definition for a (6 of 28)
a6
abbreviation Measurements.
are; ares.
Definition for a (7 of 28)
a'
or a
[ ah, aw ]
/ ɑ, ɔ /
adjective Scots
all: for a' that.
Definition for a (8 of 28)
A1
or a
[ ey ]
/ eɪ /
noun, plural A's or As, a's or as.
the first letter of the English alphabet, a vowel.
any spoken sound represented by the letter A or a, as in bake, hat, father, or small.
something having the shape of an A.
a written or printed representation of the letter A or a.
a device, as a printer's type, for reproducing the letter A or a.
Definition for a (9 of 28)
A2
abbreviation
Definition for a (10 of 28)
A3
Symbol.
Definition for a (11 of 28)
a-1
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 adjective (afar; aloud; alow), as a moribund prefix with a verb (acknowledge), and in archaic and dialectal use before a present participle in -ing (set the bells aringing); and added to a verb stem with the force of a present participle (ablaze; agape; aglow; astride; and originally, awry).
Definition for a (12 of 28)
a-2
a reduced form of the Old English preposition of: akin; afresh; anew.
Origin of a-
2Middle English; see a3
Definition for a (13 of 28)
a-3
an old point-action prefix, not referring to an act as a whole, but only to the beginning or end: She arose (rose up). They abided by their beliefs (remained faithful to the end).
Origin of a-
3Definition for a (14 of 28)
Definition for a (15 of 28)
a-5
variant of ad-, used: (1) before sc, sp, st (ascend) and (2) in words of French derivation (often with the sense of increase, addition): amass.
Definition for a (16 of 28)
Definition for a (17 of 28)
A-
atomic (used in combination): A-bomb; A-plant.
Definition for a (18 of 28)
-a1
a plural ending of nouns borrowed from Greek and Latin: phenomena; criteria; data; errata; genera.
Definition for a (19 of 28)
-a2
a feminine singular ending of nouns borrowed from Latin and Greek, also used in New Latin coinages to Latinize bases of any origin, and as a Latin substitute for the feminine ending -ē of Greek words: anabaena;cinchona;pachysandra.
Definition for a (20 of 28)
-a3
an ending of personal names forming feminines from masculines: Georgia; Roberta.
Origin of -a
3Definition for a (21 of 28)
-a4
a suffix designating the oxide of the chemical element denoted by the stem: alumina; ceria; thoria.
Origin of -a
4Probably generalized from the -a of magnesia
Definition for a (22 of 28)
Å
Symbol, Physics.
angstrom.
Definition for a (23 of 28)
a.1
abbreviation
year.
Origin of a.
1<Latin annō, ablative of annus
Definition for a (24 of 28)
a.2
abbreviation
before.
Origin of a.
2From the Latin word ante
Definition for a (25 of 28)
a.3
abbreviation
Definition for a (26 of 28)
A.1
abbreviation
year.
Origin of A.
1<Latin annō, ablative of annus
Definition for a (27 of 28)
A.2
abbreviation
before.
Origin of A.
2From the Latin word ante
Definition for a (28 of 28)
A.3
abbreviation
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for a
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British Dictionary definitions for a (1 of 11)
a1
/ (ə, stressed or emphatic eɪ) /
determiner (indefinite article; used before an initial consonant)
British Dictionary definitions for a (2 of 11)
British Dictionary definitions for a (3 of 11)
a3
/ (ə) /
preposition
(usually linked to the preceding noun) an informal form of of sorta sad; a kinda waste
British Dictionary definitions for a (4 of 11)
British Dictionary definitions for a (5 of 11)
a
A
/ (eɪ) /
noun plural a's, A's or As
the first letter and first vowel of the modern English alphabet
any of several speech sounds represented by this letter, in English as in take, bag, calm, shortage, or cobra
Also called: alpha the first in a series, esp the highest grade or mark, as in an examination
from A to Z from start to finish, thoroughly and in detail
British Dictionary definitions for a (6 of 11)
British Dictionary definitions for a (7 of 11)
A
symbol for
abbreviation for
Austria (international car registration)
Word Origin for A
from Latin a (ffirmo) I affirm
British Dictionary definitions for a (8 of 11)
a-1
before a vowel an-
prefix
not; without; opposite toatonal; asocial
Word Origin for a-
from Greek a-, an- not, without
British Dictionary definitions for a (9 of 11)
a-2
prefix
on; in; towardsafoot; abed; aground; aback
literary, or archaic (used before a present participle) in the act or process ofcome a-running; go a-hunting
in the condition or state ofafloat; alive; asleep
British Dictionary definitions for a (10 of 11)
Å
symbol for
angstrom unit
British Dictionary definitions for a (11 of 11)
A.
abbreviation for
acre(s) or acreage
America(n)
answer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for a (1 of 4)
a
abbr.
area
asymmetrical
specific absorption coefficient
systemic arterial blood (used as a subscript)
total acidity
Medical definitions for a (2 of 4)
A
abbr.
Medical definitions for a (3 of 4)
a-
pref.
Without; not:acellular.
Medical definitions for a (4 of 4)
Å
abbr.
angstrom
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for a (1 of 3)
A
Abbreviation of adenine, ampere, angstrom, area
Scientific definitions for a (2 of 3)
a-
A prefix meaning without or not when forming an adjective (such as amorphous, without form, or atypical, not typical), and absence of when forming a noun (such as arrhythmia, absence of rhythm). Before a vowel or h it becomes an- (as in anhydrous, anoxia).
Scientific definitions for a (3 of 3)
Å
Abbreviation of angstrom
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.