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accomplish	to successfully reach or get through. [1/2 definitions]
accordion	a musical instrument with a keyboard that is small enough to carry. An accordion is played by pressing the keys and squeezing the bellows to force air through metal reeds.
achievement	something achieved through hard work, courage, or skill. [1/2 definitions]
AIDS	AIDS is a serious disease that stops the body from being able to protect itself from other diseases. AIDS is caused by a virus, and the disease can be spread from one person to another, through blood, for example.
air	When you air a room, you open doors and windows so that air can move through it. You air a room to take away smoke, dust, or things that smell bad. When you air something like a pillow or rug, you put it outside so that it will smell cleaner. [1/4 definitions]
aircraft	any machine that can fly through the air, such as an airplane, helicopter, glider, or balloon.
air force	An air force is a group of people who fight like an army but fight in the air instead of on land. An air force uses airplanes and other machines that travel through the air.
algae	organisms that live mainly in the water and make their food through photosynthesis. Algae are different from plants in that they have no true leaves, roots, or stems. Seaweeds are one form of algae, but there are many others, including a large number that cannot be seen without a microscope. "Algae" is the plural form of the word "alga."
alimentary canal	the tube in the body through which food travels as it is digested. The alimentary canal goes from the mouth to the anus, and includes the esophagus, the stomach, and the small and large intestines.
along	by or through the length of; next to. [1/4 definitions]
Alps	a high mountain range that goes from southern France through Switzerland, Italy, Germany, and Austria and into the countries along the Adriatic Sea down to Albania.
ambassador	An ambassador is a person who is sent by the government of one country to be its official representative in another country. Different countries often communicate with each other through their ambassadors.
amoeba	a tiny living thing made of only one cell. Amoebas move by changing their shape. They eat by wrapping their bodies around their food. Amoebas live in fresh and salt water, soil, and in animals. Most kinds of amoebas can only be seen through a microscope.
Arabic numeral	any of the symbols for the numbers zero through nine; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
arcade	An arcade is a covered place to walk through. An arcade has small shops or places to play games along the sides. [1/2 definitions]
around	through an area. [1/12 definitions]
around the clock	through all twenty-four hours; without stopping.
artery	Arteries are natural tubes in the body that blood flows through. Blood flows away from the heart through arteries.
atmosphere	The planet Earth is surrounded by gases. These gases all together are called Earth's atmosphere. As our planet travels through space and around the sun, its atmosphere stays with it. Other planets can have an atmosphere too, but Earth's atmosphere has just the right mixture of gases for humans to live. Our atmosphere lets us breathe and also protects us from the strong energy of the sun. [1/2 definitions]
attain	to gain or achieve through work. [1/2 definitions]
axis	a real or imaginary line through the center of an object, around which the object turns. [1/2 definitions]

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