means To improve something to a higher, newer, or better version — whether a device, a service, your seat, or your situation.

from A straightforward English compound from 'up' plus 'grade,' where 'grade' descends from Latin 'gradus,' meaning a step or degree (the same root that walks through 'gradual' and 'progress'). So an upgrade is literally a step up the ladder — a 19th-century coinage that originally described raising the slope of a railway or road, later climbing into the world of breeding livestock, and finally settling comfortably into software and airline seats.