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.
Easy Sewing Projects. 1  Find this Pin and more on Sewing Projects: Yo Yos by mcsqrd. 2  Yo-yo Wall Art: Elevate yo-yos to a new level - mount them on a painted artist's canvas and present the composition as a wall hanging. To show off the colorful prints, some of these yo-yos are right side up and the rest are upside down.