<p><strong>Noun</strong></p><ul><li>a mark indicating the height to which water rises or has risen, as in a river or inlet.</li><li>a figure or design impressed in some paper during manufacture, visible when the paper is held to the light.</li><li>(also digital watermark) a small piece of code or identifiable data sequence embedded into a digital file, usually an image or an audio or video file, as a traceable marker of origin or ownership.</li></ul><p><strong>Verb</strong></p><ul><li>to mark (paper or a digital file) with a watermark.</li><li>to impress (a design, pattern, etc.), as a watermark.</li><li>to place (a digital identifier) into a file.</li></ul>