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Definition of At
1. Noun. A highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium.
2. Noun. 100 at equal 1 kip in Laos.
Definition of At
1. prep. Primarily, this word expresses the relations of presence, nearness in place or time, or direction toward; as, at the ninth hour; at the house; to aim at a mark. It is less definite than in or on; at the house may be in or near the house. From this original import are derived all the various uses of at.
Definition of At
1. in the position of [prep]
Medical Definition of At
1.