(idiomatic) To run out of energy or motivation.

(astronomy) The region of the Universe in alignment with the galactic plane of the Milky Way where few galaxies were initially seen due to dust interfering with the view of ground-based telescopes.

A particular location which is used as an endpoint when measuring distances or charting maps. / A unique, intellectual premise used to relate other to ideas.

(aeronautics) That point on an aircraft where all the various lifting forces act. If the centre or lift is not coincident with the centre of gravity on the fore/aft axis, the plane will pitch, if not coincident on the lateral axis, it will roll.

(idiomatic) The time at (or very close to) the start of the next hour of time.

(aviation) An instrument installed in an aircraft that indicates the rate at which the aircraft is gaining or losing altitude.

(obsolete) because of

(informal, physics) entropic doom of a universe

(UK, informal) A custody dispute, a dispute concerning which of two separated parents should have custody of one or more children.

(obsolete, inorganic chemistry) potassium bromide