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ammunition the objects fired from any weapon, or material that can be exploded. Bullets, bombs, and gunpowder are types of ammunition. [2 definitions]
amnesia partial or complete loss of memory as a result of an injury to the brain, illness, or shock.
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.
among in the middle of or included with. [5 definitions]
amongst among.
amount measure; quantity. [3 definitions]
ampersand a sign (&). It is used in place of the word "and."
amphibian a small animal that spends part of its life cycle in water and part of its life cycle on land. Amphibians hatch in water and breathe with gills. Then they develop lungs so the adults can breathe air. Amphibians are cold-blooded animals with skeletons inside their bodies. Frogs, toads, and salamanders are amphibians. [2 definitions]
amphibious able to live both on land and in water. [2 definitions]
amphitheater an oval or round building with seats rising in rows from an open, central area. Amphitheaters are used for sports and other public events.
amphitheatre a spelling of "amphitheater" used in Canada and Britain. See "amphitheater" for more information.
ample large in size, amount, or space; as much or more than is needed.
amplifier an electronic device used to make sound louder.
amplify to make larger or greater. [2 definitions]
amputate to cut off, especially by surgery.
Amsterdam the official capital city of the Netherlands. Most of the government of the Netherlands is located in another city, The Hague.
amt. abbreviation of "amount."
amuse to hold the interest of in a pleasant way; entertain. [2 definitions]
amusement something that amuses or entertains; fun. [2 definitions]
amusement park an outdoor place with games, rides, and other forms of entertainment.
amusing producing laughter; funny. [2 definitions]