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Latin word excello comes from Proto-Indo-European *kelH-
*kelH- (Proto-Indo-European)
celsus (Latin)
Erect. Haughty, arrogant, proud. Lofty, high, tall. Noble. Prominent, elevated.
excello (Latin)
I elevate, raise up.. I excel, surpass.. I exult, am elated.. I rise, elevate myself.