Elevation, or geometric height, is mainly used when referring to points on the Earth 's surface, while altitude or geopotential height is used for points above the surface, such as an aircraft in flight or a spacecraft in orbit, and depth is used for points below the surface.
disquiet - disturb in mind or make uneasy or cause to be worried or alarmed; She was rather perturbed by the news that her father was seriously ill Synonyms: cark, disorder, perturb, unhinge, distract, trouble
Freebase(0.00 / 0 votes)Rate this definition: Billet. A billet is a term for living quarters to which a soldier is assigned to sleep. Historically, it referred to a private dwelling that was required to accept the soldier.