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According adv. 1 (foll. By to) a as stated by (according to mary). B in proportion to (lives according to his means). 2 (foll. By as + clause) in a manner or to a degree that varies as (pays according as he is able).
Accordingly adv. 1 as circumstances suggest or require (please act accordingly). 2 consequently (accordingly, he left the room).
Accordion n. Musical reed instrument with concertina-like bellows, keys, and buttons.  accordionist n. [italian accordare to tune]
Accost v. 1 approach and address (a person), esp. Boldly. 2 (of a prostitute) solicit. [latin costa rib]
Account —n. 1 narration, description (an account of his trip). 2 arrangement at a bank etc. For depositing and withdrawing money, credit, etc. (open an account). 3 record or statement of financial transactions with the balance (kept detailed accounts). —v. Consider as (account him wise, a fool).
Accountable adj. 1 responsible; required to account for one's conduct. 2 explicable, understandable.  accountability n.
Accountant n. Professional keeper or verifier of accounts.  accountancy n. Accounting n.
Accouterments n.pl. (brit. Accoutrements) 1 equipment, trappings. 2 soldier's equipment excluding weapons and clothes. [french]
Accoutrements n.pl. (us accouterments) 1 equipment, trappings. 2 soldier's equipment excluding weapons and clothes. [french]
Accredit v. (-t-) 1 (foll. By to) attribute (a saying etc.) To (a person). 2 (foll. By with) credit (a person) with (a saying etc.). 3 (usu. Foll. By to or at) send (an ambassador etc.) With credentials. 4 gain influence for or make credible (an adviser, a statement, etc.). [french: related to *credit]
Accredited adj. 1 officially recognized. 2 generally accepted.
Accretion n. 1 growth or increase by accumulation, addition, or organic enlargement. 2 the resulting whole. 3 a matter so added. B adhesion of this to the core matter. [latin cresco cret- grow]
Accrue v. (-ues, -ued, -uing) (often foll. By to) come as a natural increase or advantage, esp. Financial. [latin: related to *accretion]
Accumulate v. (-ting) 1 acquire an increasing number or quantity of; amass, collect. 2 grow numerous; increase. [latin: related to *cumulus]
Accumulation n. 1 accumulating or being accumulated. 2 accumulated mass. 3 growth of capital by continued interest.  accumulative adj.
Accumulator n. 1 rechargeable electric cell. 2 bet placed on a sequence of events, with the winnings and stake from each placed on the next.
Accuracy n. Exactness or careful precision. [latin cura care]
Accurate adj. Careful, precise; conforming exactly with the truth or a standard.  accurately adv.
Accursed adj. 1 under a curse. 2 colloq. Detestable, annoying. [old english a- intensive prefix, *curse]
Accusation n. Accusing or being accused. [french: related to *accuse]
Accusative gram. —n. Case expressing the object of an action. —adj. Of or in this case.
Accusatory adj. Of or implying accusation.
Accuse v. (-sing) (often foll. By of) charge with a fault or crime; blame. [latin accusare: related to *cause]
Accustom v. (foll. By to) make used to (accustomed him to hardship). [french: related to *custom]
Accustomed adj. 1 (usu. Foll. By to) used to a thing. 2 customary, usual.
Ace —n. 1 playing-card etc. With a single spot and generally signifying ‘one’. 2 a person who excels in some activity. B pilot who has shot down many enemy aircraft. 3 (in tennis) unreturnable stroke (esp. A service). —adj. Slang excellent.  within an ace of on the verge of. [latin as unity]
Acellular adj. Having no cells; not consisting of cells.
Aceous suffix forming adjectives in the sense ‘of the nature of’, esp. In the natural sciences (herbaceous). [latin -aceus]
Acerbic adj. Harsh and sharp, esp. In speech or manner.  acerbity n. (pl. -ies). [latin acerbus sour]
Acetaldehyde n. Colourless volatile liquid aldehyde. [from *acetic, *aldehyde]
Acetate n. 1 salt or ester of acetic acid, esp. The cellulose ester. 2 fabric made from this.
Acetic adj. Of or like vinegar. [latin acetum vinegar]
Acetic acid n. Clear liquid acid giving vinegar its characteristic taste.
Acetone n. Colourless volatile liquid that dissolves organic compounds, esp. Paints, varnishes, etc.
Acetylene n. Hydrocarbon gas burning with a bright flame, used esp. In welding.
Ache —n. 1 continuous dull pain. 2 mental distress. —v. (-ching) suffer from or be the source of an ache. [old english]
Achieve v. (-ving) 1 reach or attain, esp. By effort (achieved victory; achieved notoriety). 2 accomplish (a feat or task). [french achever: related to *chief]
Achievement n. 1 something achieved. 2 act of achieving.
Achilles heel n. Person's weak or vulnerable point. [achilles, greek hero in the iliad]
Achilles tendon n. Tendon connecting the heel with the calf muscles.
Achromatic adj. Optics 1 transmitting light without separation into constituent colours (achromatic lens). 2 without colour.  achromatically adv. [french: related to *a-, *chrome]
Achy adj. (-ier, -iest) full of or suffering from aches.
Acid —n. 1 a any of a class of substances that liberate hydrogen ions in water, are usu. Sour and corrosive, turn litmus red, and have a ph of less than 7. B any compound or atom donating protons. 2 any sour substance. 3 slang the drug lsd. —adj. 1 sour. 2 biting, sharp (an acid wit). 3 chem. Having the essential properties of an acid.  acidic adj. Acidify v. (-ies, -ied). Acidity n. Acidly adv. [latin aceo be sour]
Acid house n. A type of synthesized music with a simple repetitive beat, often associated with hallucinogenic drugs.
Acid rain n. Acid, esp. From industrial waste gases, falling with rain.
Acid test n. Severe or conclusive test.
Acidulous adj. Somewhat acid.
Ack-ack colloq. —adj. Anti-aircraft. —n. Anti-aircraft gun etc. [formerly signallers' term for aa]
Acknowledge v. (-ging) 1 recognize; accept the truth of (acknowledged its failure). 2 confirm the receipt of (a letter etc.). 3 a show that one has noticed (acknowledged my arrival with a grunt). B express appreciation of (a service etc.). 4 recognize the validity of, own (the acknowledged king). [from *ad-, *knowledge]
Acknowledgement n. 1 act of acknowledging. 2 a thing given or done in gratitude. B letter confirming receipt of something. 3 (usu. In pl.) Author's statement of gratitude, prefacing a book.
Acme n. Highest point (of achievement etc.). [greek]