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.
a form of hair extensions. often used by black women, and celebrites. it's woven, or glued, into the hair from the track. if done rite, it comes out cute. it may even look real, if its done real good. Nahoje: ooh Taquasha, yo weave is mad cute.