The act of observing: observations of a rare bird. The power or faculty of observing. The fact of being observed: kept the suspect under observation. The act or process of perceiving something, such as a phenomenon, often by means of an instrument, and making a record of the resulting information. The result or record of such an act or process: a meteorological observation. An inference, judgment, or remark that is made by observing: made some sharp observations about the movie.