Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The science that deals with signs or sign language.
  • noun The use of signs in signaling, as with a semaphore.
  • noun Symptomatology.

from The Century Dictionary.

  • noun The logical theory of signs, of the conditions of their fulfilling their functions, of their chief kinds, etc.
  • noun The use of gestures to express thought.
  • noun The sum of scientific knowledge concerning morbid symptoms and their pathological significance; symptomatology; semiotics.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Semiotics, the study of signs.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun (philosophy) a philosophical theory of the functions of signs and symbols

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek sēmeion, sign; see semiotic + –logy.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

New Latin semaeologia, from Ancient Greek σημεῖον ("sign") + -logia ("-logy")

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