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Acne n. Skin condition with red pimples. [latin]
Acolyte n. 1 person assisting a priest. 2 assistant; beginner. [greek akolouthos follower]
Aconite n. 1 any of various poisonous plants, esp. Monkshood. 2 drug from these. [greek akoniton]
Acorn n. Fruit of the oak, with a smooth nut in a cuplike base. [old english]
Acoustic adj. 1 of sound or the sense of hearing. 2 (of a musical instrument etc.) Without electrical amplification (acoustic guitar).  acoustically adv. [greek akouo hear]
Acoustics n.pl. 1 properties or qualities (of a room etc.) In transmitting sound. 2 (usu. As sing.) Science of sound.
Acquaint v. (usu. Foll. By with) make aware of or familiar with (acquaint me with the facts).  be acquainted with have personal knowledge of; know slightly. [latin: related to *ad-, *cognizance]
Acquaintance n. 1 being acquainted. 2 person one knows slightly.  acquaintanceship n.
Acquiesce v. (-cing) 1 agree, esp. By default. 2 (foll. By in) accept (an arrangement etc.).  acquiescence n. Acquiescent adj. [latin: related to *ad-, *quiet]
Acquire v. (-ring) gain for oneself; come into possession of. [latin: related to *ad-, quaero quisit- seek]
Acquired immune deficiency syndrome see *aids.
Acquired taste n. 1 liking developed by experience. 2 object of this.
Acquirement n. Thing acquired, esp. A mental attainment.
Acquisition n. 1 thing acquired, esp. When useful. 2 acquiring or being acquired. [latin: related to *acquire]
Acquisitive adj. Keen to acquire things.
Acquit v. (-tt-) 1 (often foll. By of) declare not guilty. 2 refl. A behave or perform in a specified way (acquitted herself well). B (foll. By of) discharge (a duty or responsibility).  acquittal n. [latin: related to *ad-, *quit]
Acre n. Measure of land, 4,840 sq. Yds., 0.405 ha. [old english]
Acreage n. A number of acres; extent of land.
Acrid adj. (-er, -est) bitterly pungent.  acridity n. [latin acer keen, pungent]
Acrimonious adj. Bitter in manner or temper.  acrimony n.
Acrobat n. Entertainer performing gymnastic feats.  acrobatic adj. Acrobatically adv. [greek akrobates from akron summit, baino walk]
Acrobatics n.pl. 1 acrobatic feats. 2 (as sing.) Art of performing these.
Acronym n. Word formed from the initial letters of other words (e.g. Laser, nato). [greek akron end, onoma name]
Acropolis n. Citadel of an ancient greek city. [greek akron summit, polis city]
Across 鈥攑rep. 1 to or on the other side of (across the river). 2 from one side to another side of (spread across the floor). 3 at or forming an angle with (a stripe across the flag). 鈥攁dv. 1 to or on the other side (ran across). 2 from one side to another (stretched across).  across the board applying to all. [french 脿, en, croix: related to *cross]
Acrostic n. Poem etc. In which certain letters (usu. The first and last in each line) form a word or words. [greek akron end, stikhos row]
Acrylic 鈥攁dj. Of synthetic material made from acrylic acid. 鈥攏. Acrylic fibre or fabric. [latin acer pungent, oleo to smell]
Acrylic acid n. A pungent liquid organic acid.
Act 鈥攏. 1 something done; a deed. 2 process of doing (caught in the act). 3 item of entertainment. 4 pretence (all an act). 5 main division of a play etc. 6 a decree of a legislative body. B document attesting a legal transaction. 鈥攙. 1 behave (acted wisely). 2 perform an action or function; take action (act as referee; brakes failed to act; he acted quickly). 3 (also foll. By on) have an effect (alcohol acts on the brain). 4 a perform a part in a play, film, etc. B pretend. 5 a play the part of (acted othello; acts the fool). B perform (a play etc.). C portray (an incident) by actions.  act for be the (esp. Legal) representative of. Act of god natural event, e.g. An earthquake. Act up colloq. Misbehave; give trouble (car is acting up). Get one's act together slang become properly organized; prepare. Put on an act colloq. Make a pretence. [latin ago act- do]
Acting 鈥攏. Art or occupation of an actor. 鈥攁ttrib. Adj. Serving temporarily or as a substitute (acting manager).
Actinism n. Property of short-wave radiation that produces chemical changes, as in photography. [greek aktis ray]
Actinium n. Chem. Radioactive metallic element found in pitchblende. [as *actinism]
Action n. 1 process of doing or acting (demanded action). 2 forcefulness or energy. 3 exertion of energy or influence (action of acid on metal). 4 deed, act (not aware of his actions). 5 (the action) a series of events in a story, play, etc. B slang exciting activity (missed the action). 6 battle, fighting (killed in action). 7 a mechanism of an instrument. B style of movement of an animal or human. 8 lawsuit.  out of action not working. [latin: related to *act]
Actionable adj. Giving cause for legal action.
Action-packed adj. Full of action or excitement.
Action point n. Proposal for action.
Action replay n. Playback of part of a television broadcast, esp. A sporting event, often in slow motion.
Action stations n.pl. Positions taken up by troops etc. Ready for battle.
Activate v. (-ting) 1 make active. 2 chem. Cause reaction in. 3 make radioactive.
Active 鈥攁dj. 1 marked by action; energetic; diligent (an active life). 2 working, operative (active volcano). 3 not merely passive or inert; positive (active support; active ingredients). 4 radioactive. 5 gram. Designating the form of a verb whose subject performs the action (e.g. Saw in he saw a film). 鈥攏. Gram. Active form or voice of a verb.  actively adv. [latin: related to *act]
Active service n. Military service in wartime.
Activism n. Policy of vigorous action, esp. For a political cause.  activist n.
Activity n. (pl. -ies) 1 being active; busy or energetic action. 2 (often in pl.) Occupation or pursuit (outdoor activities). 3 = *radioactivity.
Actor n. Person who acts in a play, film, etc. [latin: related to *act]
Actress n. Female actor.
Actual adj. (usu. Attrib.) 1 existing in fact; real. 2 current. [latin: related to *act]
Actuality n. (pl. -ies) 1 reality. 2 (in pl.) Existing conditions.
Actually adv. 1 as a fact, really (not actually very rich). 2 strange as it may seem (he actually refused!).
Actuary n. (pl. -ies) statistician, esp. One calculating insurance risks and premiums.  actuarial adj. [latin actuarius bookkeeper]
Actuate v. (-ting) 1 cause (a machine etc.) To move or function. 2 cause (a person) to act. [latin]
Acuity n. Sharpness, acuteness. [medieval latin: related to *acute]