1.Definition: a reservation that is improved

"I got an upgrade to first class when coach class was full"

Category: General

2.Definition: an upward slope or grade (as in a road)

Related Noun(s):acclivity, ascent, climb, raise, rise

Category: Objects

3.Definition: hardware that provides better performance than an earlier version did

Category: Objects

4.Definition: software that provides better performance than an earlier version did

Category: General

5.Definition: 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"

Category: General

6.Definition: the property possessed by a slope or surface that rises

Related Noun(s):rise

Category: General