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.
Definition of yo-yo in the AudioEnglish.org Dictionary. Meaning of yo-yo. What does yo-yo mean? Proper usage and pronunciation (in phonetic transcription) of the word yo-yo. Information about yo-yo in the AudioEnglish.org dictionary, synonyms and antonyms.