The act or position of one that sits. A period during which one is seated and occupied with a single activity, such as posing for a portrait or reading a book. A session, as of a legislature or court. An act, condition, or period of brooding on eggs by a bird; incubation. The number of eggs under a brooding bird; a clutch. Incubating a nest of eggs: a sitting hen. Occupying an official position; incumbent. Of or for sitting: a sitting posture; a sitting area in a bus station. Done or executed while sitting.