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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]
attain	to gain or achieve through work. [2 definitions]
attempt	to try or seek. [3 definitions]
attend	to be present at. [4 definitions]
attendance	the act of being present at an event. [2 definitions]
attendant	a person who serves another person.

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