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Adversary n. (pl. -ies) enemy, opponent.
Adverse adj. Unfavourable; harmful.  adversely adv. [latin: related to *ad-, verto vers- turn]
Adversity n. Misfortune, distress.
Advert n. Colloq. Advertisement. [abbreviation]
Advertise v. (-sing) 1 promote (goods or services) publicly to increase sales. 2 make generally known. 3 (often foll. By for) seek by a notice in a newspaper etc. To buy, employ, sell, etc. [french avertir: related to *adverse]
Advertisement n. 1 public announcement, esp. Of goods etc. For sale or wanted, vacancies, etc. 2 advertising. [french avertissement: related to *adverse]
Advice n. 1 recommendation on how to act. 2 information given; news. 3 formal notice of a transaction.
Advisable adj. To be recommended, expedient.  advisability n.
Advise v. (-sing) 1 (also absol.) Give advice to. 2 recommend (advised me to rest). 3 (usu. Foll. By of, or that + clause) inform. [latin: related to *ad-, video vis- see]
Advisedly adv. After due consideration; deliberately.
Adviser n. (also advisor) person who advises, esp. Officially.
Usage the variant advisor is fairly common, but is considered incorrect by many people.
Advisory adj. Giving advice (advisory body).
Advocaat n. Liqueur of eggs, sugar, and brandy. [dutch, = *advocate]
Advocacy n. Support or argument for a cause, policy, etc.
Advocate —n. 1 (foll. By of) person who supports or speaks in favour. 2 person who pleads for another, esp. In a lawcourt. —v. (-ting) recommend by argument. [latin: related to *ad-, voco call]
Adz n. (brit adze) tool like an axe, with an arched blade at right angles to the handle. [old english]
Adze n. (us adz) tool like an axe, with an arched blade at right angles to the handle. [old english]
Aegis n. Protection; support. [greek aigis shield of zeus or athene]
Aeolian harp n. Stringed instrument or toy sounding when the wind passes through it. [latin aeolus wind-god, from greek]
Aeon n. (also eon) 1 long or indefinite period. 2 an age. [latin from greek]
Aerate v. (-ting) 1 charge (a liquid) with carbon dioxide. 2 expose to air.  aeration n. [latin aer *air]
Aerial —n. Device for transmitting or receiving radio waves. —adj. 1 by or from the air; involving aircraft (aerial attack). 2 existing in the air. 3 of or like air. [greek: related to *air]
Aero- comb. Form air; aircraft. [greek aero- from aer air]
Aerobatics n.pl. 1 spectacular flying of aircraft, esp. To entertain. 2 (as sing.) Performance of these. [from *aero-, after *acrobatics]
Aerobics n.pl. Vigorous exercises designed to increase oxygen intake.  aerobic adj. [from *aero-, greek bios life]
Aerodrome n. Small airport or airfield. [from *aero-, greek dromos course]
Aerodynamics n.pl. (usu. Treated as sing.) Dynamics of solid bodies moving through air.  aerodynamic adj.
Aerofoil n. Structure with curved surfaces (e.g. A wing, fin, or tailplane) designed to give lift in flight.
Aeronautics n.pl. (usu. Treated as sing.) Science or practice of motion in the air.  aeronautic adj. Aeronautical adj. [from *aero-, *nautical]
Aeroplane n. Powered heavier-than-air flying vehicle with fixed wings. [french: related to *aero-, *plane1]
Aerosol n. 1 pressurized container releasing a substance as a fine spray. 2 system of minute particles suspended in gas (e.g. Fog or smoke). [from *aero-, *solution]
Aerospace n. 1 earth's atmosphere and outer space. 2 aviation in this.
Aesthete n. Person who has or professes a special appreciation of beauty. [greek aisthanomai perceive]
Aesthete n. Person who has or professes a special appreciation of beauty. [greek aisthanomai perceive]
Aesthetic —adj. 1 of or sensitive to beauty. 2 artistic, tasteful. —n. (in pl.) Philosophy of beauty, esp. In art.  aesthetically adv. Aestheticism n.
Aetiology n. (us etiology) study of causation or of the causes of disease.  aetiological adj. [greek aitia cause]
Af abbr. Audio frequency.
Afar adv. At or to a distance.
Affable adj. 1 friendly. 2 courteous.  affability n. Affably adv. [latin affabilis]
Affair n. 1 matter, concern, or thing to be attended to (that is my affair). 2 a celebrated or notorious happening. B colloq. Thing or event (puzzling affair). 3 = *love affair. 4 (in pl.) Public or private business. [french à faire to do]
Affect v. 1 a produce an effect on. B (of disease etc.) Attack. 2 move emotionally. 3 pretend (affected ignorance). 4 pose as or use for effect (affects the aesthete; affects fancy hats).  affecting adj. Affectingly adv. [latin afficio affect- influence]
Usage affect should not be confused with effect, meaning ‘to bring about’. Note also that effect is used as a noun as well as a verb.
Affectation n. 1 artificial manner. 2 (foll. By of) studied display. 3 pretence.
Affected adj. 1 pretended, artificial. 2 full of affectation.
Affection n. 1 goodwill, fond feeling. 2 disease; diseased condition.
Affectionate adj. Loving, fond.  affectionately adv.
Affidavit n. Written statement confirmed by oath. [latin, = has stated on oath]
Affiliate —v. (-ting) (foll. By to, with) attach, adopt, or connect as a member or branch. —n. Affiliated person etc. [latin: related to *filial]
Affiliation n. Affiliating or being affiliated.