| 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. |