2. A situation in which someone, or something, is gone or missing: When Mildred's daughter went to college, it left a big hole in the lives of their parents; in other words, they missed their daughter very much.
Holistic medicine attempts to treat both the whole mind and body.
2. Complete or full; not lacking or leaving out any part: The community center offers a whole range of programs.
The whole hole must be considered when using holistic analysis.
2. In a semiconductor, the electron vacancy in the valence (combining power of atoms) band that occurs when an electron jumps the gap from the filled valence band to the empty conduction band.
It serves as a positive charge carrier, allowing electrons deeper in the band to move into the vacated area.
A valence is the combining power of atoms or groups measured by the number of electrons the atom or group will receive, give up, or share in forming a compound.
2. A process by which a molecule is excited from a low-lying electronic state to a higher energy electronic state as observed in germanium and silicon at sufficiently low cryogenic temperatures.
It is associated with a liquid-gas phase transition of the charge carriers, and consists of regions of conducting electron-hole Fermi liquid coexisting with regions of insulating exciton gas.
The ozone hole has grown in size and annual length of existence over the past decades.
2. An object whose matter has become so condensed that its gravitational field is striking enough to prevent light escaping from it.
3. In theory, a collapsed object (perhaps a massive star) whose gravitational field is so strong that under most circumstances no light or matter can escape.
The term was invented by the American physicist John Wheeler in 1968 (some sources say 1967). Within a few years, other usages had expanded the phrase for other applications; such as, to describe everything from large budget deficits to gaping legal loopholes.
The "black hole" is also used as a verb. In technological circles, to "black-hole" means to cut off data going to and coming from an address, particularly an address used by a spammer. This usage has been around since about 1997.