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
The definition of a billet is a place in a nonmilitary facility where soldiers live temporarily. When an ordinary citizen lets a soldier live in his house, this is an example of a billet. verb. To billet is defined as to provide temporary housing for soldiers in a non-military facility. When you open up your home and let a soldier live there temporarily, this is an example of a time when you billet. Obs. a brief document or letter.