WordWeb Online

1. With a forward motion
   "the circus travelled on to the next city"; "march on";
   - along
    
2. Indicates continuity, persistence or concentration
   "his spirit lives on"; "shall I read on?"
    
3. In a state required for something to function or be effective
   "turn the lights on"; "get a load on"

1. In operation or operational
   "left the oven on"; "the switch is in the on position"
    
2. (of events) planned or scheduled
   "the picnic is on, rain or shine"; "we have nothing on for Friday night"

1. At some time in the duration of
   "I'll come some time on Sunday";
   - during
    
2. In contact with, on top of
   "the book on the table";
   - upon
    
3. Located at or attached to
   "there's a jam on the main road"; "the clock on the wall"
    
4. Part of; a member of
   "she's on the shortlist";
   - in
    
5. On the topic of
   "a book on physics";
   - about
    
6. Paid for by
   "dinner's on me"; "drinks are on the house"
    
7. Supported by
   "balanced on one leg";
   - upon
    
8. At or following a prescribed point in time
   "The contract was rendered void on his death";
   - upon
    
9. Having something
   "I don't have any on me";
   - with

See also: connected

Antonym: cancelled [Brit, Cdn], off

Encyclopedia: On, WI