at

A term of considerable elasticity of meaning, and somewhat indefinite. A function word to describe or indicate presence or occurrence in, on, or near; or to indicate the means, cause, or manner; or to indicate that with which one is occupied or employed. As used to fix a time, it does not necessarily mean eo instante or the identical time named, or even a fixed definite moment. Often expresses simply nearness and proximity, and consequently may denote a reasonable time