(n) upgrade (hardware that provides better performance than an earlier version did)
(n) upgrade (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"
(v) upgrade (rate higher; raise in value or esteem)
(v) upgrade (to improve what was old or outdated) "I've upgraded my computer so I can run better software"; "The company upgraded their personnel"
(v) promote , upgrade, advance , kick upstairs , raise , elevate (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"
(v) upgrade (get better travel conditions) "I upgraded to First Class when Coach Class was overbooked"
(v) upgrade (give better travel conditions to) "The airline upgraded me when I arrived late and Coach Class was full"