the word 'surplus' entered english in the late 14th century from old french, which itself was a compound of the latin elements 'super' (over, above) and 'plus' (more). the literal sense of 'over-more' or 'an excess over what is counted' was used in legal and financial contexts to denote a remainder. this concrete numerical meaning gradually broadened to encompass any general situation where an amount exceeds what is required or consumed, perfectly preserving the logical combination of its two latin roots into its modern abstract sense of an excess.

Structure: sur (over) + plus (more) sur- (from latin 'super', meaning 'over, above'); -plus (from latin 'plus', meaning 'more').