Definition of "OM"

(politics) Initialism of Occupy movement.  examples

(Commonwealth, UK) Initialism of Order of Merit. (a dynastic order of the Royal House of Windsor)  examples

(aviation) Initialism of outer marker.  examples

(medicine) Initialism of otitis media.  examples

Initialism of old measurement.  examples

(CB radio slang) Initialism of old man (term of address for a male).  quotations

Initialism of operations manager.  examples