Definitions
1.noun(broad sense) A weather phenomenon consisting of a system of winds rotating around a center of low atmospheric pressure
2.noun(narrow sense) Such weather phenomenon occurring in the South Pacific and Indian Ocean
3.nounA low pressure system.
4.nounThe more or less violent, small-scale circulations such as tornadoes, waterspouts, and dust devils.
5.nounA strong wind.
6.nounA cyclone separator; the cylindrical vortex tube within such a separator