| accelerando | (noun) a gradually increasing tempo of music | - |
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| acceleration | (noun) the act of accelerating; increasing the speed | Synonyms: quickening, speedup |
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| (noun) an increase in rate of change | - |
| (noun) (physics) a rate of increase of velocity | - |
| accelerator | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: throttle, throttle valve |
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| (noun) a scientific instrument that increases the kinetic energy of charged particles | Synonyms: atom smasher, particle accelerator |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator pedal, gas, gas pedal, gun, throttle |
| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: catalyst |
| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| accent | (noun) the relative prominence of a syllable or musical note (especially with regard to stress or pitch) | Synonyms: emphasis, stress |
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| (noun) distinctive manner of oral expression | Synonyms: speech pattern |
| (noun) a diacritical mark used to indicate stress or placed above a vowel to indicate a special pronunciation | Synonyms: accent mark |
| (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: dialect, idiom |
| (noun) special importance or significance | Synonyms: emphasis |
| accenting | (noun) the act of giving special importance or significance to something | Synonyms: accentuation, emphasizing |
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| accentor | (noun) small sparrow-like songbird of mountainous regions of Eurasia | - |
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| accentuation | (noun) the act of giving special importance or significance to something | Synonyms: accenting, emphasizing |
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| (noun) the use or application of an accent; the relative prominence of syllables in a phrase or utterance | - |
| acceptability | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptableness |
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| acceptableness | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptability |
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| acceptance | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptation, adoption, espousal |
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| (noun) the act of taking something that is offered | - |
| (noun) a disposition to tolerate or accept people or situations | Synonyms: sufferance, toleration |
| (noun) the mental attitude that something is believable and should be accepted as true | Synonyms: credence |
| (noun) (contract law) words signifying consent to the terms of an offer (thereby creating a contract) | - |
| (noun) a time draft drawn on and accepted by a bank | Synonyms: banker's acceptance |
| (noun) the state of being acceptable and accepted | - |
| acceptation | (noun) the act of accepting with approval; favorable reception | Synonyms: acceptance, adoption, espousal |
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| (noun) the accepted meaning of a word | Synonyms: word meaning, word sense |
| (noun) acceptance as true or valid | - |
| acceptor | (noun) the person (or institution) who accepts a check or draft and becomes responsible for paying the party named in the draft when it matures | - |
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| (noun) (chemistry) in the formation of a coordinate bond it is the compound to which electrons are donated | - |
| access | (noun) the act of approaching or entering | - |
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| (noun) a way of entering or leaving | Synonyms: approach |
| (noun) (computer science) the operation of reading or writing stored information | Synonyms: memory access |
| (noun) the right to enter | Synonyms: accession, admission, admittance, entree |
| (noun) the right to obtain or make use of or take advantage of something (as services or membership) | - |
| (noun) a code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.) | Synonyms: access code |
| accessary | (noun) someone who helps another person commit a crime | Synonyms: accessory |
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| accessibility | (noun) the quality of being at hand when needed | Synonyms: availability, availableness, handiness |
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| (noun) the attribute of being easy to meet or deal with | Synonyms: approachability |
| accession | (noun) the act of attaining or gaining access to a new office or right or position (especially the throne) | Synonyms: rise to power |
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| (noun) the right to enter | Synonyms: access, admission, admittance, entree |
| (noun) agreeing with or consenting to (often unwillingly) | Synonyms: assenting |
| (noun) something added to what you already have | Synonyms: addition |
| (noun) (civil law) the right to all of that which your property produces whether by growth or improvement | - |
| (noun) a process of increasing by addition (as to a collection or group) | - |
| accessory | (noun) a supplementary component that improves capability | Synonyms: add-on, appurtenance, supplement |
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| (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accouterment, accoutrement |
| (noun) someone who helps another person commit a crime | Synonyms: accessary |