Visible belongs to one of the largest word families in English, all descended from a single Proto-Indo-European root: *weid-, meaning both 'to see' and 'to know'. The ancient conflation of sight and knowledge shaped two entire branches of vocabulary. On the Latin side, vidēre ('to see') generated vision, video, visit, vista, evidence, provide, and visible itself. On the Germanic side, the same root produced wise, wit, witness, and the archaic wot ('to know'). Greek took it in yet another direction with eidos ('form, idea'), giving English idea and idol. Visible entered English through Old French in the mid-fourteenth century, drawn from Latin visibilis — literally 'able to be seen'. The word has always carried both a physical sense (visible to the eye) and a figurative one (visible progress, a visible effort). Its opposite, invisible, arrived at almost the same moment, confirming that English speakers immediately saw the utility of the Latin prefix system.