projection vs watermark

projection

noun
  • The image that a translucent object casts onto another object. 

  • The action of projecting or throwing or propelling something. 

  • A forecast or prognosis obtained by extrapolation 

  • An idempotent linear transformation which maps vectors from a vector space onto a subspace. 

  • Any of several systems of intersecting lines that allow the curved surface of the earth to be represented on a flat surface. The set of mathematics used to calculate coordinate positions. 

  • The display of an image by devices such as movie projector, video projector, overhead projector or slide projector. 

  • A belief or assumption that others have similar thoughts and experiences to one's own. This includes making accusations that would more fittingly apply to the accuser. 

  • Something which projects, protrudes, juts out, sticks out, or stands out. 

  • An image of an object on a surface of fewer dimensions. 

  • A transformation which extracts a fragment of a mathematical object. 

  • A morphism from a categorical product to one of its (two) components. 

  • The preservation of the properties of lexical items while generating the phrase structure of a sentence. See Projection principle. 

watermark

noun
  • A translucent design impressed on the surface of paper and visible when the paper is held to the light. 

  • A mark indicating the level to which water has risen. 

  • A logo superimposed on a digital image, a television broadcast, etc. 

  • 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. 

verb
  • To mark paper with a watermark. 

  • To mark a datafile with a digital watermark. 

How often have the words projection and watermark occurred in a corpus of books? (source: Google Ngram Viewer )