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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.
at one's heels following closely.
atop at or on the highest point of.
at present right now.
at rest not active, not moving, or sleeping.
a trifle a little bit; somewhat; slightly.
atrium a courtyard inside a building, either open to the sky or with a glass ceiling. [2 definitions]
atrocious very evil, cruel, or brutal. [2 definitions]
at sea on the ocean waters. [2 definitions]
at stake in danger of being lost.
attach to join, fasten, or connect. [3 definitions]
attached feeling strong affection for and not wanting to part with.
attachment the act or process of attaching. [3 definitions]
attack to begin to cause harm to. [5 definitions]