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| actuate | 
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| (actuate) put into motion or action; activate E.g.I fail to understand what might actuate you to reply to this letter so nastily. | 
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| acuity | 
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| (Acuity) sharpness; acuteness of vision or perception; keenness E.g.In time his youthful acuity of vision failed him, and he needed glasses. | 
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| acute | 
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| (cấp) quickly perceptive; keen; having a sharp point or tip; extremely sharp or severe E.g.Her early writing was grounded in acute observation of the natural world. | 
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| adamant | 
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| (kiên quyết) extremely hard; inflexible; stubbornly unyielding E.g.Speaker Pelosi came out of that meeting, and she was once again adamant about saying a public option must be in the bill. | 
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| adapt | 
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| (thích ứng) make fit for; change to suit a new purpose E.g.One way to adapt is to become smaller, generation by generation. | 
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| addendum | 
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| (phụ lục) something added or to be added, especially a supplement to a book E.g.The date on the bottom of the addendum is April 2007. | 
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| addle | 
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| (ung hư) muddle; drive crazy; become confused E.g.This idiotic plan is confusing enough to addle anyone. | 
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| adhere | 
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| (tuân thủ) stick fast; stick to firmly; be compatible or in accordance with E.g.That is why the claying is necessary; it makes the grain adhere to the earth, otherwise it would float. | 
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| adherent | 
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| (dính) person who adheres; one who follows or upholds a leader, party, cause E.g.In the wake of the scandal, John, the senator's one-time adherent, quickly deserted him. | 
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| adjacent | 
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| (lân cận) adjoining; neighboring; close to; lying near E.g.Philip's best friend Jason lived only four houses down the block, close but not immediately adjacent. | 
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| admonish | 
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| (nhắc nhở) warn; counsel someone against something to be avoided E.g.I would again admonish the reader carefully to consider the nature of our doctrine. | 
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| adorn | 
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| (tô điểm) enhance or decorate with or as if with ornaments E.g.This small icon indicates that the plastic yard sign they adorn is either recyclable. | 
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| adroit | 
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| (chăm chỉ) skillful and adept under pressing conditions E.g.I should work in adroit references to this evening's speeches. |