Physics, Chemistry. 1  a wave function describing the state of a single electron in an atom (atomic orbital) or in a molecule (molecular orbital) 2  the electron in that state.
DEFINITION of 'Yo-Yo'. Slang for a very volatile market. A yo-yo market will have no distinguishing features of either an up or down market, taking on characterstics of both. Security prices in a yo-yo market will swing very high to low over a given period of time, making it difficult for buy and hold investors to profit. Next Up.
The Yo-Yo test was developed by Danish soccer physiologist Jens Bangsbo to test the endurance level of an individual. However, the level differs from game to game. When asked if the yo-yo test would be the mandatory parameter for selection across formats, Johari said, âYes, but it is not the only parameter for selection.