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Agronomy n. Science of soil management and crop production.  agronomist n. [greek agros land]
Aground predic. Adj. & adv. On or on to the bottom of shallow water (run aground).
Ague n. 1 hist. Malarial fever. 2 shivering fit. [latin: related to *acute]
Ah abbr. In the year of the hegira (ad 622); of the muslim era. [latin anno hegirae]
Ah int. Expressing surprise, pleasure, realization, etc. [french a]
Aha int. Expressing surprise, triumph, mockery, etc. [from *ah, *ha1]
Ahead adv. 1 further forward in space or time. 2 in the lead (ahead on points).
Ahem int. Used to attract attention, gain time, etc. [from *hem2]
Ahoy int. Naut. Call used in hailing. [from *ah, *hoy]
Ai abbr. 1 artificial insemination. 2 artificial intelligence.
Aid abbr. Artificial insemination by donor.
Aid —n. 1 help. 2 person or thing that helps. —v. 1 help. 2 promote (sleep will aid recovery).  in aid of 1 in support of. 2 colloq. For the purpose of (what's it all in aid of?). [latin: related to *ad-, juvo help]
Aide n. 1 aide-de-camp. 2 esp. Us assistant. [french]
Aide-de-camp n. (pl. Aides-de-camp pronunc. Same) officer assisting a senior officer. [french]
Aids n. (also aids) acquired immune deficiency syndrome, an often fatal viral syndrome marked by severe loss of resistance to infection. [abbreviation]
Ail v. 1 archaic (only in 3rd person interrog. Or indefinite constructions) trouble or afflict (what ails him?). 2 (usu. Be ailing) be ill. [old english]
Aileron n. Hinged flap on an aeroplane wing. [french aile wing]
Ailing adj. 1 ill. 2 in poor condition.
Ailment n. Minor illness or disorder.
Aim —v. 1 intend or try; attempt (aim at winning; aim to win). 2 (usu. Foll. By at) direct or point (a weapon, remark, etc.). 3 take aim. —n. 1 purpose or object. 2 the directing of a weapon etc. At an object.  take aim direct a weapon etc. At a target. [latin aestimare reckon]
Aimless adj. Without aim or purpose.  aimlessly adv.
Ain't contr. Colloq. 1 am, is, or are not. 2 have or has not.
Usage the use of ain't is usually regarded as unacceptable in spoken and written english.
Aimless adj. Without aim or purpose.  aimlessly adv.
Ain't contr. Colloq. 1 am, is, or are not. 2 have or has not.
Usage the use of ain't is usually regarded as unacceptable in spoken and written english.
Air —n. 1 mixture mainly of oxygen and nitrogen surrounding the earth. 2 earth's atmosphere; open space in it; this as a place for flying aircraft. 3 a distinctive impression or manner (air of mystery). B (esp. In pl.) Pretentiousness (gave himself airs). 4 tune. 5 light wind. —v. 1 expose (clothes, a room, etc.) To fresh air or warmth to remove damp. 2 express and discuss publicly (an opinion, question, grievance, etc.).  by air by or in an aircraft. In the air 1 (of opinions etc.) Prevalent. 2 (of plans etc.) Uncertain. On (or off) the air being (or not being) broadcast. [greek aer]
Airbase n. Base for military aircraft.
Air-bed n. Inflatable mattress.
Airborne adj. 1 transported by air. 2 (of aircraft) in the air after taking off.
Air-brick n. Perforated brick used for ventilation.
Airbus n. Propr. Short-haul passenger aircraft.
Air chief marshal n. Raf officer of high rank, above air marshal.
Air commodore n. Raf officer next above group captain.
Air-conditioning n. 1 system for regulating the humidity, ventilation, and temperature in a building. 2 apparatus for this.  air-conditioned adj.
Aircraft n. (pl. Same) machine capable of flight, esp. An aeroplane or helicopter.
Aircraft-carrier n. Warship carrying and used as a base for aircraft.
Aircraftman n. Lowest rank in the raf.
Aircraftwoman n. Lowest rank in the wraf.
Aircrew n. Crew of an aircraft.
Air-cushion n. 1 inflatable cushion. 2 layer of air supporting a hovercraft etc.
Airedale n. Large terrier of a rough-coated breed. [airedale in yorkshire]
Airer n. Stand for airing or drying clothes etc.
Airfield n. Area with runway(s) for aircraft.
Air force n. Branch of the armed forces fighting in the air.
Airgun n. Gun using compressed air to fire pellets.
Airhead n. Slang stupid or foolish person.
Air hostess n. Stewardess in a passenger aircraft.
Airless adj. Stuffy; still, calm.
Air letter n. Sheet of light paper forming a letter for sending by airmail.