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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]
atone to make up for; make amends.