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Children's Dictionary
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agronomy the scientific study of the use of soil for producing crops.
ah a word used to express surprise, joy, pain, understanding, dislike, and other feelings.
aha a word used to express feelings like surprise, success, discovery, or satisfaction.
ahead before; in front. [3 definitions]
ahoy a word used as a greeting to attract the attention of sailors on a ship.
aid to give help to or assist. [3 definitions]
aide any assistant or person who gives support.
AIDS a serious disease caused by a virus that stops the body from being able to protect itself from other diseases. "AIDS" stands for "acquired immune deficiency syndrome."
ail to trouble or cause pain to. [2 definitions]
ailment a sickness or disorder; illness.
aim to point carefully with the hope of hitting something or someone. [6 definitions]
aimless having no purpose or goal.
ain't (informal) a contraction of "am not," "is not," "are not," "have not," or "has not."
air the mixture of gases that surrounds the earth. Air is made up of oxygen, nitrogen, and other gases, and has no taste, odor, or color. [6 definitions]
air bag a bag in the front of some cars that blows up with air instantly in a crash to stop the passengers from being thrown forward.
air conditioner a machine that cools the air in a room or car. An air conditioner also takes the dust and dampness out of the air.
air conditioning a system that cools air and takes dust and dampness out of it. Air conditioning is used inside buildings and cars.
aircraft any machine that can fly through the air, such as an airplane, helicopter, glider, or balloon.
aircraft carrier a very large ship with a flat deck on which airplanes can take off and land.
air force the branch of a nation's armed forces that trains and fights using aircraft.
airline a system of transportation that allows people to fly from one place to another, or a business that owns and operates the equipment to do this.