upgrade (Noun) — An upward slope or grade (as in a road).
upgrade (Noun) — Software that provides better performance than an earlier version did.
upgrade (Noun) — A reservation that is improved. ex. "I got an upgrade to first class when coach class was full"
upgrade (Noun) — The property possessed by a slope or surface that rises.
upgrade (Noun) — Hardware that provides better performance than an earlier version did.
upgrade (Noun) — The act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components). ex. "the power plant received a new upgrade"
upgrade (Verb) — Rate higher; raise in value or esteem.
upgrade (Verb) — To improve what was old or outdated. ex. "I've upgraded my computer so I can run better software" ex. "The company upgraded their personnel"
upgrade (Verb) — Give a promotion to or assign to a higher position. ex. "I got upgraded after many years of hard work"
upgrade (Verb) — Get better travel conditions. ex. "I upgraded to First Class when Coach Class was overbooked"
upgrade (Verb) — Give better travel conditions to. ex. "The airline upgraded me when I arrived late and Coach Class was full"