Definitions from Wiktionary (watermark)

▸ noun:  A translucent design impressed on the surface of paper and visible when the paper is held to the light.
▸ noun:  (by extension) A logo superimposed on a digital image, a television broadcast, etc.
▸ noun:  (computing) A value stored in a datafile to ensure its integrity, so that if the file's contents are changed then the watermark will no longer match the contents.
▸ noun:  (graphical user interface) A default hint caption displayed in a text box prior to the user inputting any text.
▸ noun:  A mark indicating the level to which water has risen.
▸ verb:  (transitive) To mark paper with a watermark.
▸ verb:  (transitive) To mark a datafile with a digital watermark.

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