SIGN, AS A CONTRACT is a legal term that refers to the process of signing a contract. Inking, executing, and entering into a contract are all steps in the process of signing a contract. Inking is the act of signing a document with a pen or other writing instrument. Executing is the act of formally completing a contract by signing it. Entering into a contract is the act of agreeing to the terms of a contract. All three of these steps are necessary for a contract to be legally binding.