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BNC: 5 COCA: 5

a

833 ENTRIES FOUND:
1 a noun
or A /ˈeɪ/
plural a's or as or A's or As
1 a
noun
or A /ˈeɪ/
plural a's or as or A's or As
Learner's definition of A
1 
: the first letter of the English alphabet英语字母表的第1个字母
[count]
[noncount]
2 
: a musical note or key referred to by the letter A : the sixth tone of a C-major scale*A音（C大调音阶的第6音或音符）；A调
[count]
[noncount]
3 
[count] : a grade that is given to a student for doing excellent work（学业成绩）第一等，优秀
4 
[noncount] — used to refer to the first of two or more people, places, or things that are being considered（正在考虑的人、地点或事物中的）第一个，甲

an A for effort

— see effort

exhibit A

— see 2exhibit

from A to Z

: including everything从头到尾；全部

from (point) A to (point) B

: from one place to another从一地到另一地
2 a /ə/ /ˈeɪ/ indefinite article
or an /ən/ /ˈæn/
2 a
/ə/ /ˈeɪ/
indefinite article
or an /ən/ /ˈæn/
Learner's definition of A
◊ A is used before a consonant sound.*a用于辅音之前。
An is used before a vowel sound.*an用于元音之前。
Note that when a word begins with a vowel letter but is pronounced with a consonant sound, a is used.注意：当单词首字母是元音字母但其发音为辅音时，用a。
When an abbreviation begins with a consonant letter but is pronounced with a vowel sound, an is used.当缩略词首字母是辅音字母但其发音为元音时，用an。
When a word begins with h but the first syllable of the word is not given primary stress, both a and an are used.当单词以h开头，但该单词的首音节非重读时，a和an都可用。
1 
— used before singular nouns when the person or thing is being mentioned for the first time用于首次被提及的单数名词前
2 
a  — used like one before number words like hundred, thousand, etc.用于hundred、thousand等数词前，用法同one
b  — used like one before number words like third, fortieth, etc.用于third、fortieth等序数词前，用法同one
c  — used like one before units of weight, measurement, etc.用于计量单位前，用法同one
d  : one single : even one — used in negative constructions一个，单个（用于否定结构）
3 
— used before a word or phrase that indicates a type or class of person or thing用于表示一类人或一类事物的单词或短语前
— often used before noncount nouns that are modified by an adjective or phrase常用于由形容词或短语修饰的不可数名词前
4 
— used like any to refer in a general way to people or things用于泛指人或事物，用法同any
5 
— used before a proper noun to indicate limited knowledge about the person or thing being mentioned用于专有名词前，表示对提及的人或事物所知有限
6 
a  — used before a proper noun that is acting as an example or type用于充当例证或典型的专有名词前
b  — used before the name of a day of the week to refer to one occurrence of it用于一星期中某天的名称前，以提及当天发生的某件事情
7 
a  — used before the name of a person (such as a famous artist) when the name is being used to refer to something (such as a painting) created by that person用于人名前，指此人的作品
b  — used before a family name to show that someone is a member of that family用于姓氏前，表示某人为此家庭的一员
8 
— used before a proper noun referring to a person or thing that has a particular quality用于专有名词前，表示某人或某物具有某种特殊品质
9 
— used with words like bit and little to form phrases that describe quantity, amount, or degree与bit、little等单词连用构成短语，表数量、程度等
10 
— used in phrases that describe how often something occurs, how fast something is going, etc.用于表示频率、快慢等的短语

See also: a

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