means A person who converts spoken words from one language into another, usually on the spot and out loud, so two parties who don't share a tongue can understand each other.

from From Latin 'interpres,' meaning a negotiator, agent, or go-between — someone standing in the middle of a deal. The second part may be related to 'pretium,' meaning price or value, fitting for a figure who brokered exchanges. It came through Old French 'interpreteur' into English in the late Middle Ages, keeping that original sense of the middleman who makes a bargain — or a conversation — possible.