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athletics (usually used with a plural verb) sports and physical activities.
Atlanta the capital city of the U.S. state of Georgia.
Atlantic an ocean bordered by Europe and Africa on the east and North and South America on the west; Atlantic Ocean.
Atlantic Ocean an ocean that is bordered by Europe and Africa on the east and by North and South America on the west.
atlas (cap.) a giant in Greek mythology who had to support the heavens on his shoulders. [2 definitions]
Atlas Mountains a range of mountains in northwest Africa stretching across the southwestern part of Morocco and northern parts of Algeria and Tunisia.
at last after a long time or wait; finally.
at least at the lowest amount; not less than. [2 definitions]
at length for a long time; in great detail. [2 definitions]
at liberty free from being confined. [2 definitions]
at loose ends without clear plans or things to do; not sure what to do with oneself; uneasy.
ATM an abbreviation for automated teller machine, a computerized machine used for banking.
atmosphere the gases surrounding the earth or other similar objects in outer space. [3 definitions]
atmospheric of, relating to, or made of the gases that surround the earth.
at odds not agreeing.
atoll an island or reef that surrounds a lagoon. An atoll is shaped like a ring.
atom the smallest possible unit of a chemical element. The major parts of atoms contain protons, neutrons, and electrons. They are the basis of all matter in the universe. [2 definitions]
atomic having to do with atoms or energy made from atoms. [2 definitions]
atomic bomb a very destructive bomb; atom bomb. Its power comes from the great amount of energy released when atoms are split.
atomic energy the energy that is released by atoms in nuclear reactions. [2 definitions]
at once at the same time. [2 definitions]