Meaning of 'watch' (Webster Dictionary)
                    
                    
                                                    
                             - An allotted portion of time, usually four hour for standing
   watch, or being on deck ready for duty. Cf. Dogwatch.
 - That part, usually one half, of the officers and crew, who
   together attend to the working of a vessel for an allotted time,
   usually four hours. The watches are designated as the port watch, and
   the starboard watch.
                                                    
                             - The act of watching; forbearance of sleep; vigil;
   wakeful, vigilant, or constantly observant attention; close
   observation; guard; preservative or preventive vigilance; formerly, a
   watching or guarding by night.
 - One who watches, or those who watch; a watchman, or a
   body of watchmen; a sentry; a guard.
 - The post or office of a watchman; also, the place where a
   watchman is posted, or where a guard is kept.
 - The period of the night during which a person does duty
   as a sentinel, or guard; the time from the placing of a sentinel till
   his relief; hence, a division of the night.
 - A small timepiece, or chronometer, to be carried about
   the person, the machinery of which is moved by a spring.
 - To be awake; to be or continue without sleep; to wake; to
   keep vigil.
 - To be attentive or vigilant; to give heed; to be on the
   lookout; to keep guard; to act as sentinel.
 - To be expectant; to look with expectation; to wait; to
   seek opportunity.
 - To remain awake with any one as nurse or attendant; to
   attend on the sick during the night; as, to watch with a man in a
   fever.
 - To serve the purpose of a watchman by floating properly
   in its place; -- said of a buoy.
                                                    
                             - To give heed to; to observe the actions or motions of,
   for any purpose; to keep in view; not to lose from sight and
   observation; as, to watch the progress of a bill in the legislature.
 - To tend; to guard; to have in keeping.
                                            
                 
            
            
                
                    
                        
Meaning of 'watch' (Princeton's WordNet)
                    
                    
                                                                                                            
                                                            Meaning (1): 
 - see or watch
                                 Example in  sentence:-  Catch a show on Broadway;
 - see a movie;
 - This program will be seen all over the world;
 - view a show on television;
 - view an exhibition
 
 
                                                                                                                    Meaning (2): 
 - find out, learn, or determine with certainty, usually by making an inquiry or other effort
                                 Example in  sentence:-  Check whether the train leaves on time;
 - find out if he speaks Russian;
 - I want to see whether she speaks French;
 - See whether it works
 
 
                                                                                                                    Meaning (3): 
 - follow with the eyes or the mind
                                 Example in  sentence:-  Keep an eye on the baby, please!;
 - She followed the men with the binoculars;
 - The world is watching Sarajevo
 
 
                                                                                                                    Meaning (4): 
 - observe with attention
                                 Example in  sentence:-  They watched as the murderer was executed
 
 
                                                                                                                    Meaning (5): 
 - look attentively
                                
                                                                                                                    Meaning (6): 
 - observe or determine by looking
                                 Example in  sentence:-  Watch how the dog chases the cats away
 
 
                                                                                                                    Meaning (7): 
 - be vigilant, be on the lookout or be careful
                                 Example in  sentence:-  Watch out for pickpockets!