get on in WordNet English dictionary

1. develop in a positive way
   "He progressed well in school"; "My plants are coming along"; "Plans are shaping up"
   progress  come on  come along  advance  get on  get along  shape up 
   
2. grow old or older
   "She aged gracefully"; "we age every day--what a depressing thought!"; "Young men senesce"
   senesce  age  get on  mature  maturate 
   
3. appear in a show, on T.V. or radio
   "The news won't be on tonight"
   get on  be on 
   
4. get up on the back of
   "mount a horse"
   hop on  mount  mount up  get on  jump on  climb on  bestride 
   
5. get on board of (trains, buses, ships, aircraft, etc.)
   board  get on 
   
6. have smooth relations
   "My boss and I get along very well"
   get along with  get on with  get on  get along 
   
7. grow late or (of time) elapse
   "It is getting on midnight--let's all go to bed!"
   get on 
   

get on in English Wiktionary