upgrade

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To raise to a higher grade or standard.
• intransitive verb To replace (a software program) with a more recently released, enhanced version.
• intransitive verb To replace (a hardware device) with one that provides better performance.
• intransitive verb To improve the quality of (livestock or crops) through breeding.
• intransitive verb To exchange a possession for one of greater value or quality; trade up.
• intransitive verb Computers To replace software or hardware with an upgrade.
• noun The act or an instance of upgrading.
• noun A software program that provides added enhancements over an earlier version.
• noun A hardware device that provides greater performance than an earlier model.
• noun An upward incline.
• adverb & adjective Uphill.
• idiom (on the upgrade) Improving or progressing.

from The Century Dictionary.

• In stock-raising, to raise the grade of by the introduction of a higher strain of blood: as, to upgrade a herd.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun an improved component or replacement item, usually applied to technology
• verb to improve, usually applied to technology, generally by complete replacement of one or more components
• verb to replace an existing object with something better
• verb computing to replace a program with a later version of itself, a version having a higher version number or marketed under a more recent product name

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb give better travel conditions to
• verb get better travel conditions
• verb to improve what was old or outdated
• noun a reservation that is improved
• verb rate higher; raise in value or esteem
• noun the property possessed by a slope or surface that rises
• verb give a promotion to or assign to a higher position
• noun hardware that provides better performance than an earlier version did
• noun the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components)
• noun an upward slope or grade (as in a road)
• noun software that provides better performance than an earlier version did