means To render is to produce, deliver, or transform something into a finished form — whether that's giving back what's owed, melting fat from meat, applying plaster to a wall, or computing an image from data.

from From Old French 'rendre,' to give back or yield, which traces to a reshaped form of Latin 'reddere' — 'red-' (back) plus 'dare' (to give). So at heart 'render' has always meant to give something up or hand it over: rent rendered to a lord, fat rendered from flesh, a verdict rendered by a court, and now an image rendered by a machine that gives back the picture the math was holding.