noun (n)

• the act of drawing a plan or diagram or outline(noun.act)

  source: wordnet30
• a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image(noun.artifact)

  Synonym:
  trace
  

  source: wordnet30
• the discovery and description of the course of development of something(noun.act)

  Example:
  The tracing of genealogies.
  

  source: wordnet30
• The act of one who traces; especially, the act of copying by marking on thin paper, or other transparent substance, the lines of a pattern placed beneath; also, the copy thus producted.(noun)

  source: webster1913