2  Dictionary SEARCH A

http://www.oxforddictionaries.com/definition/english/A?q=a

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Definition of A in English

A1

Pronunciation: /eɪ/

(also a)

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noun (plural As or A's)

1.          1the first letter of the alphabet.

2.          denoting the first in a set of items, categories, sizes, etc..

3.          denoting the first of two or more hypothetical people or things:suppose A had killed B

4.          the highest class of academic mark: a dazzling array of straight A’s

5.          (in the UK) denoting the most important category of road, other than a motorway:the A34 busy A-roads

6.          denoting the highest-earning socio-economic category for marketing purposes, including top management and senior professional personnel.

7.          (a) Chess denoting the first file from the left, as viewed from White’s side of the board.

8.          (usually a) the first constant to appear in an algebraic expression.

9.          Geology denoting the uppermost soil horizon, especially the topsoil.

10.      the human blood type (in the ABO system) containing the A antigen and lacking the B.

11.      (with numeral) denoting a series of international standard paper sizes each twice the area of the next, as A0, A1, A2, A3, A4, etc., A4 being 210 × 297 mm.

12.      2a shape like that of a capital A: [in combination]:an A-shape

13.      3 Music the sixth note of the diatonic scale of C major. The A above middle C is usually used as the basis for tuning and in modern music has a standard frequency of 440 Hz.

14.      a key based on a scale with A as its keynote.

Phrases

from A to B

from one’s starting point to one’s destination:most road atlases will get you from A to B

from A to Z

over the entire range; completely: make sure you understand the subject from A to Z

plan A

one’s original plan or strategy:plan A having gone horribly wrong, Ferguson used the interval to change his formationCompare with plan B.

A in other Oxford dictionaries

Definition of A in the US English dictionary

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