upgrade in WordNet English dictionary

1. an upward slope or grade (as in a road)
   "the car couldn't make it up the rise"
   ascent  acclivity  rise  raise  climb  upgrade 
   
2. the property possessed by a slope or surface that rises
   upgrade  rise  rising slope 
   
3. the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components)
   "the power plant received a new upgrade"
   upgrade 
   
4. hardware that provides better performance than an earlier version did
   upgrade 
   
5. a reservation that is improved
   "I got an upgrade to first class when coach class was full"
   upgrade 
   
6. software that provides better performance than an earlier version did
   upgrade 
   

1. give a promotion to or assign to a higher position
   "John was kicked upstairs when a replacement was hired"; "Women tend not to advance in the major law firms"; "I got promoted after many years of hard work"
   promote  upgrade  advance  kick upstairs  raise  elevate 
   
2. to improve what was old or outdated
   "I've upgraded my computer so I can run better software"; "The company upgraded their personnel"
   upgrade 
   
3. give better travel conditions to
   "The airline upgraded me when I arrived late and Coach Class was full"
   upgrade 
   
4. get better travel conditions
   "I upgraded to First Class when Coach Class was overbooked"
   upgrade 
   
5. rate higher; raise in value or esteem
   upgrade 
   

upgrade in English Wiktionary