See upgrade in Webster's New World Roget's A-Z Thesaurus II
verb
To advance to a more desirable state:
ameliorate, amend, better1, help, improve, meliorate. See helpTo raise in rank:
advance, elevate, jump, promote, raise. See rise
noun
The act of making better or the condition of being made better:
amelioration, amendment, betterment, improvement, melioration. See betterA progression upward in rank:
advancement, elevation, jump, promotion, rise. See rise
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