con·science: early 13c., from O.Fr. conscience...from L. conscientia "knowledge within oneself, sense of right, a moral sense," from conscientem (nom. consciens), prp. of conscire "be (mutually) aware," from com- "with," or "thoroughly" (see com-) + scire "to know" (see science). Probably a loan-translation of Gk. syneidesis, lit. "with-knowledge." Sometimes nativized in O.E./M.E. as inwit. Russian also uses a loan-translation, so-vest, "conscience," lit. "with-knowledge." (Merriam-Webster)
