The editors of the TLL state that the Latin noun convenientia is a vox a CIC. ficta. From the dialogues De finibus, De natura deorum, and De divinatione, it is clear that Cicero coined the noun for a very specific reason: convenientia is the Latin equivalent of two technical Greek terms in Stoic philosophy – ὁμολογία and συμπάθεια. But it is not immediately obvious why Cicero saw this Latin word as an equivalent to both Greek words and as an effective choice of philosophical translation. In this paper I first seek to recover the reasoning behind Cicero’s choice. I then turn to the discussion of decorum in the first book of De officiis where convenientia is used somewhat differently and for a striking philosophical purpose. I show how Cicero presents a process where the ability to detect convenientia in nature is definitive of the human being and guides a human life to its appropriate rational end, which is itself expressive of convenientia.