Signature/ˈsɪɡnətʃər/ Definition 1 of 5Pro Tip 1/3Personal Identification Used as proof of one's identity, often required on official documents. Please, add your signature here to confirm your identity. Pro Tip 2/3Legally Binding Indicates agreement or consent, especially in legal contracts or forms. By providing your signature, you agree to the terms. Pro Tip 3/3Physical Act Usually involves a pen and paper, but can also include electronic methods. She practiced writing her signature on the paper.