<p><strong>preposition</strong></p><ul><li>(used to indicate a point or place occupied in space): in, on, or near: to stand at the door; at the bottom of the barrel.</li><li>(used to indicate a location or position, as in time, on a scale, or in order): at zero; at noon; at age 65; at the end; at the lowest point.</li><li>(used to indicate presence or location): at home; at hand.</li><li>(used to indicate amount, degree, or rate): at great speed; at high altitudes.</li><li>(used to indicate a direction, goal, or objective): toward: Aim at the mark. Look at that.</li><li>(used to indicate occupation or involvement): at work; at play.</li><li>(used to indicate a state or condition): at ease; at peace.</li><li>(used to indicate a cause or source): She was annoyed at his stupidity.</li><li>(used to indicate a method or manner): He spoke at length.</li><li>(used to indicate relative quality or value): at one's best; at cost.</li></ul>