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A

A


A
abbr.
1. accusative
2. Games ace
3. across
4. adenine
5. alto
6. ampere
7. or ? angstrom
8. area

a 1 or A  ()
n. pl. as or As also as or As
1. The first letter of the modern English alphabet.
2. Any of the speech sounds represented by the letter a.
3. The first in a series.
4. Something shaped like the letter A.
5. A The best or highest in quality or rank: grade A milk.
6. Music
a. The sixth tone in the scale of C major or the first tone in the relative minor scale.
b. A key or scale in which A is the tonic.
c. A written or printed note representing this tone.
d. A string, key, or pipe tuned to the pitch of this tone.
7. A One of the four major blood groups in the ABO system. Individuals with this blood group have the A antigen on the surface of their red blood cells, and the anti-B antibody in their blood serum.
Idiom:
from A to Z
Completely; thoroughly.

a 2  (; when stressed)
indef.art.
1. Used before nouns and noun phrases that denote a single but unspecified person or thing: a region; a person.
2. Used before terms, such as few or many, that denote number, amount, quantity, or degree: only a few of the voters; a bit more rest; a little excited.
3.
a. Used before a proper name to denote a type or a member of a class: the wisdom of a Socrates.
b. Used before a mass noun to indicate a single type or example: a dry wine.
4. The same: birds of a feather.
5. Any: not a drop to drink.

[Middle English, variant of an, an; see an1.]
Usage Note: In writing, the form a is used before a word beginning with a consonant sound, regardless of its spelling (a frog, a university). The form an is used before a word beginning with a vowel sound (an orange, an hour). · An was once a common variant before words beginning with h in which the first syllable was unstressed; thus 18th-century authors wrote either a historical or an historical but a history, not an history. This usage made sense in that people often did not pronounce the initial h in words such as historical and heroic, but by the late 19th century educated speakers usually pronounced initial h, and the practice of writing an before such words began to die out. Nowadays it survives primarily before the word historical. One may also come across it in the phrases an hysterectomy or an hereditary trait. These usages are acceptable in formal writing.

a 3  ()
prep.
In every; to each; per: once a month; one dollar a pound.

[Middle English, from Old English an, in; see on.]

a 4  ()
aux.v. Informal
Have: Hed a come if he could.

[Middle English, alteration of haven, to have; see have.]

a 5
abbr.
1. acceleration
2. are (measurement)

a, A [eɪ]
n pl as, As, As
1. (Linguistics) the first letter and first vowel of the modern English alphabet
2. (Linguistics / Phonetics & Phonology) any of several speech sounds represented by this letter, in English as in take, bag, calm, shortage, or cobra
3. (Social Science / Education) 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

A
symbol for
1. (Music / Classical Music) Music
a.  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
b.  a key, string, or pipe producing this note
c.  the major or minor key having this note as its tonic
2. (Life Sciences & Allied Applications / Biochemistry) a human blood type of the ABO group, containing the A antigen
3. (Engineering / Automotive Engineering) (in Britain) a major arterial road the A3 runs from London to Portsmouth
4. (Performing Arts) (formerly, in Britain)
a.  a film certified for viewing by anyone, but which contains material that some parents may not wish their children to see
b.  (as modifier) an A film
5. (Physics / General Physics) mass number
6. (Mathematics) the number 10 in hexadecimal notation
7. (Group Games / Card Games) Cards ace
8. (Chemistry) argon (now superseded by Ar)
9. (Electronics) ampere(s)
10. (Engineering / Electrical Engineering) Also at ampere-turn
11. (Physics / General Physics) absolute (temperature)
12. (Electronics) (in circuit diagrams) ammeter
13. (Mathematics) area
14. (Physics / General Physics) (in combination) atomic an A-bomb an A-plant
15. (Chemistry) Chem affinity
16. (Life Sciences & Allied Applications / Biochemistry) Biochem adenine
17. (Philosophy / Logic) Logic a universal affirmative categorical proposition, such as all men are mortal: often symbolized as SaP Compare E, I2 O1
[from Latin a(ffirmo) I affirm]
18.
a.  a person whose job is in top management, or who holds a senior administrative or professional position
b.  (as modifier) an A worker See also occupation groupings
19. (Engineering / Automotive Engineering)
international car registration for Austria

a1
determiner (indefinite article; used before an initial consonant. Compare an1)
1. used preceding a singular countable noun, if the noun is not previously specified or known a dog a terrible disappointment
2. used preceding a proper noun to indicate that a person or thing has some of the qualities of the one named a Romeo a Shylock
3. used preceding a noun or determiner of quantity a cupful a dozen eggs a great many to read a lot
4. used preceding a noun indicating a concrete or abstract thing capable of being divided half a loaf a quarter of a minute
5. (preceded by once, twice, several times, etc.) each or every; per once a day fifty pence a pound
6. a certain; one to change policy at a stroke a Mr Jones called
7. (preceded by not) any at all not a hope Compare the1

a2
vb
an informal or dialect word for have theyd a said if theyd known

a3
prep
(usually linked to the preceding noun) an informal form of of sorta sad a kinda waste

a4
symbol for
1. (Physics / General Physics) acceleration
2. (Mathematics & Measurements / Units) are(s) (metric measure of land)
3. (Mathematics & Measurements / Units) atto-
4. (Group Games / Chess & Draughts) Chess See algebraic notation

A
Abbreviation of adenine, ampere, angstrom, area

?
Abbreviation of angstrom


a  //  ;strong form /e/ or an indef. article 1 used before a noun or noun phrase to show one person or thing: A man stopped me to ask what time it was. 2 used before terms that show a general number, amount, or quantity (a few, a lot, etc.): A lot of people went to the concert.||That item costs $10 a pound (a dozen, a ton, etc.). See: an USAGE NOTE; APIECE. A

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