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.
1. Use the hole in the center of the tray to pop the disk out when done. 2. This slightly raised ridge is the finished size (outside edge/ fold line) of the yo-yo made with this tool. Each tool has a finished-sized indicator (either a ridge, or a hole the size and shape of the yo-yo). 3. Area inside the ridge will be the back of the finished yo-yo.