Keywords: punctual, punctually, precisely
Sign Definition
As a Verb or Adjective
                                            1.  To happen exactly at the time arranged. English = (be) punctual. Idiomatic English = (be) on time.
                                          
                                          
                                        
                                            2.  To happen exactly on the hour.
                                          
                                          
                                        As Modifier
                                            1.  Used immediately next to a time sign specifying a particular time (6 o'clock, 9 o'clock, etc.) to mean that time exactly. English = precisely. Idiomatic English = on the dot.
                                          
                                          
                                        
                                            2.  Used immediately next to a verb to mean the action takes place exactly at the time it is meant to, usually on the hour. English = punctually.
                                          
                                          
                                         
                  
                      