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BNC: 5 COCA: 5
a
noun
singulara
plurala's
singularA
pluralA's

or A /eɪ/

  1. 1
    [C/U] the first letter of the English alphabet. A is a vowel. 英语字母表的第1个字母（为元音字母）
     Synonyms and related words
    The English alphabet: a, ABC, aitch...
  2. 2

    A

    [C/U] music the sixth note in the musical scale of C major C大调音阶中的第6个音符
     Synonyms and related words
    Notes in the musical scale: A, b, bass...
  3. 3

    A

    [C/U] education a mark that a teacher gives to a student's work to show that it is excellent 甲，优（表示学业成绩第一等的符号）
     Synonyms and related words
    Grades and marks given for school or university work: A, A minus/B minus/C minus/D minus, A plus/B plus/C plus/D plus...
  4. 4

    A

    [U] medical a common blood group in the ABO system A血型
     Synonyms and related words
    The heart, blood and circulation: A, ABO system, anticoagulant...

phrases

See also
a
★
★
★
determiner strong /eɪ/ weak /ə/

or anstrong /æn/weak /ən/

A or an is used as an indefinite article, usually followed by a singular countable noun. a或an用作不定冠词，通常后接单数可数名词。
A is used when the next word begins with a consonant. a用于以辅音开头的单词前。
An is used when the next word begins with a vowel sound. an用于以元音开头的单词前。
When a word begins with the letter ‘u' that is pronounced / juː/, the word is treated as starting with a consonant: 单词如以字母u 开头且发音是/juː/， 按辅音开头处理: a university 一所大学。
When a word begins with a silent ‘h', it is treated as starting with a vowel: 单词如以不发音的字母h 开头，按元音开头处理: an hour 一个小时。
The names of the letters f, h, l, m, n, r, s, and x begin with vowel sounds, so abbreviations that begin with one of these letters are treated as starting with a vowel: 字母f， h， l， m， n， r， s， x 以元音发音开头，因此以这些字母开头的缩略语按元音开头处理: an MP 一位议员 an HGV 一辆大型运货卡车。
  1. 1
    used when you are mentioning a person or a thing for the first time, or when the person listening to you does not already know about them 一（个）（用于第一次提到的人或事物，或听者不知道的人或事物时）

    I have an idea. 我有一个想法。

    There's a concert on Sunday night. 周日晚上有一场音乐会。

     Synonyms and related words
    Determiners: a, a certain, an...
  2. 2
    used when you mean any person or thing of a particular type, but you are not referring to a specific one （泛指特定类别中的）任何一（个）

    You need a dictionary. 你需要一本词典。

    I haven't got an umbrella. 我没带伞。

    Children must be accompanied by an adult. 儿童必须有成人陪伴。

     Synonyms and related words
    Determiners: a, a certain, an...
  3. 3
    used when you say what class, type, or group someone or something belongs to, or what job someone has （用于指某人或某事物所属的阶层、类别、群体或某人的工种时）一（个）

    He's a liar and a cheat. 他既是个说谎者又是个骗子。

    Greece has been a republic since 1973. 希腊自1973年以来一直是共和国。

    Ruth's father was a lawyer. 露丝的父亲是律师。

     Synonyms and related words
    Determiners: a, a certain, an...
  4. 4
    used before a singular noun that represents every person or thing of a particular type （同类别中的）每一（个）

    A dog needs regular exercise. 狗都需要定期遛一遛。

    A molecule consists of two or more atoms. 每个分子由两个或多个原子组成。

     Synonyms and related words
    Determiners: a, a certain, an...
  5. 5
    used when you are referring to a person or thing as one of several people or things of this type （多个中的）一（个）

    I want you to meet a friend of mine. 我想让你见见我的一个朋友。

    He's a member of the team. 他是球队中的一员。

     Synonyms and related words
    Determiners: a, a certain, an...
  6. 6
    used in expressions of quantity such as ‘a lot', ‘a few', or ‘a great deal' （用于表示数量的词组如a lot, a few, a great deal 中）

    a lot of money 许多钱

    a bit of luck 一点运气

    We all appreciate a little encouragement. 对于鼓励我们都很感激。

     Synonyms and related words
    Determiners: a, a certain, an...
  7. 7
    used in numbers and measurements to mean ‘one', as in ‘a thousand' or ‘an hour' 一（用于数字和度量词中）

    a million dollars 100万美元

    a hundred years ago 100年前

    a minute or two 一两分钟

     Synonyms and related words
    Determiners: a, a certain, an...
  8. 8
    used in phrases showing how much something costs, how often it happens, how fast it goes etc 一，每（用于表示某事物的花费、频率、速度等的短语中）

    Meetings are held four times a year. 会议每年举行4次。

    Tomatoes are £1.20 a kilo (=each kilo costs £1.20). 西红柿每公斤1.2英镑。

    The car was travelling at 90 miles an hour. 那辆轿车在以每小时90英里的速度行驶。

     Synonyms and related words
    Determiners: a, a certain, an...
  9. 9
    used before a noun that means a substance, product, food etc when referring to a particular type of it 一种（用于表示物质、产品、食物等的名词前）

    Brie is a soft creamy cheese. 布里干酪是一种软而滑的奶酪。

    Plants won't grow in a soil that contains too much lime. 植物在石灰含量太高的土壤中不能生长。

     Synonyms and related words
    Determiners: a, a certain, an...
  10. 10
    used before the name of some drinks to mean a cup or glass of that drink （用于表示饮料的名词前）一杯

    I'll just have a beer, thanks. 我就要一杯啤酒，谢谢。

    Have you got time for a coffee? 你有空喝杯咖啡吗？

     Synonyms and related words
    Determiners: a, a certain, an...
  11. 11
    used before a noun that means a particular quality or feeling when the quality or feeling is described in some way （用于表示某种品质或情感的名词前）

    Sales staff must have a good working knowledge of French. 销售人员必须相当熟练地掌握足以应付工作的法语知识。

    They fought back with a fierce determination that surprised the invaders. 他们以坚定的决心进行反击，让入侵者措手不及。

     Synonyms and related words
    Determiners: a, a certain, an...
  12. 12
    used before a noun that is formed from a verb and means a single action of that verb （用于源于动词并表示该动作的名词前）一下，一次

    Can I have a try? 我能试一下吗？

    Let's take a walk round the garden. 我们绕花园走一走吧。

     Synonyms and related words
    Determiners: a, a certain, an...
  13. 13
    used before a noun that expresses your feelings about a situation （用于表示对某种情况之感受的名词前）

    It's a relief to know they're safe. 知道他们平安无事让人松了一口气。

    What a shame he couldn't be there to receive the prize! 可惜的是他不能去那儿领奖！

     Synonyms and related words
    Determiners: a, a certain, an...
  14. 14
    used before the name of a particular day, season, or holiday to mean one particular Tuesday, summer, Christmas etc （用于表示某天、某季节、某假日的名词前）某个

    It was a bitterly cold winter. 那是个严寒刺骨的冬天。

    She was born at six o'clock on a Sunday morning. 她是在一个星期天的早上6点出生的。

     Synonyms and related words
    Determiners: a, a certain, an...
  15. 15
    used before a person's name when you do not know anything about them （用于不认识的人名前）某个

    There's a Mr Alex Murray asking to see you. 一位名叫亚历克斯·默里的先生要见您。

     Synonyms and related words
    Determiners: a, a certain, an...
    1. a.
      used before the name of a famous artist to mean a picture by that artist （用于著名艺术家的名字前）一件…的作品

      The gallery has recently acquired a Picasso. 美术馆最近得到了一幅毕加索的画。

       Synonyms and related words
      Words used to describe works of art or crafts: a, abstract, accessible...
    2. b.
      used before a family name to mean a member of that family （用于姓之前）…家族中的一员

      Remember you're an Osborne – it's a name to be proud of. 记住你是奥斯本家族的一员——这是个值得骄傲的姓氏。

       Synonyms and related words
      Determiners: a, a certain, an...
    3. c.
      used before the name of a famous person to mean someone else with similar abilities, a similar appearance, or a similar character （用于名人姓名之前）类似…的一个

      Already he is being hailed as a young Albert Einstein. 他已经被誉为小阿尔伯特·爱因斯坦了。

       Synonyms and related words
      Determiners: a, a certain, an...
A
abbreviation
  1. amp
     Synonyms and related words
    Units for measuring electrical power:A, amp, ampere...
A
noun
  1. From our crowdsourced Open Dictionary
    an A for effort being appreciated for having tried hard to do something rather than for achieving success

    In response to my surprise in passing the exam, my mother suspected I had got an A for effort.

    Submitted by Boris Marchenko from Russian Federation on 11/07/2017
     

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