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■ used before countable or singular nouns referring to people or things that have not already been mentioned: U is a vowel but begins with / j / and so you say: a UN declaration. For example, F is a consonant, but begins with the sound / e / and so you say: When saying abbreviations like ‘FM' or ‘UN', use a or an according to how the first letter is said. The form a is used before consonant sounds and the form an before vowel sounds. ə NAmE strong form eɪ NAmE / (also an / ən NAmE strong form æn NAmE /) indefinite article ■ used (but not in the US) before numbers which show standard metric sizes of paper: ■ used in Britain before a number to refer to a particular important road: Including everything there is to know about sth: For me a car is just a means of getting from A to B.

■ A used to represent a person, for example in an imagined situation or to hide their identity: ■ A used to represent the first of two or more possibilities: He had straight A's (= nothing but A's) all through high school. ■ the highest mark / grade that a student can get for a piece of work or course of study: ■ A ( music) the 6th note in the scale of C major ■ the first letter of the English alphabet: Verb and noun senses 1 to 4late Middle English: perhaps related to the verb tag.noun sense 51960s: abbreviation. ■ to use the tab key when you are using a keyboard He has been tabbed by many people as a future champion. ■ ( especially NAmE) tab sb (as) sth to say that sb is suitable for a particular job or role or describe them in a particular way: It's not always possible to keep tabs on everyone's movements. ( informal) to watch sb/sth carefully in order to know what is happening so that you can control a particular situation: ■ ( informal) a small solid piece of an illegal drug: The tab for the meeting could be $3 000. ■ a bill for goods you receive but pay for later, especially for food or drinks in a restaurant or bar the price or cost of sth: Insert tab A into slot 1 (= for example to make a model, box, etc.). that sticks out from the edge of sth, and that is used to give information about it, or to hold it, fasten it, etc.: ■ a small piece of paper, cloth, metal, etc.