In physics, the intrinsic angular momentum of a subatomic particle, nucleus, atom, or molecule, which continues to exist even when the particle comes to rest. A particle in a specific energy state has a particular spin, just as it has a particular electric charge and mass. According to quantum theory, this is restricted to discrete and indivisible values, specified by a spin quantum number. Because of its spin, a charged particle acts as a small magnet and is affected by magnetic fields.
1. A swift whirling motion (usually of a missile).
2. The act of rotating rapidly; SYN. twirl, twist, twisting, whirl.

(Irregular preterit, past participle: spun).
1. To revolve quickly and repeatedly around one's own axis; SYN. spin around, whirl, reel, gyrate.
2. To work natural fibers into a thread.
3. To form a web by making a thread, as of spiders.
4. To prolong or extend; SYN. spin out.
5. To make up a story, as in.
6. To stream in jets, of liquids.