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sign definition

  1. a perceptible indication of something not immediately apparent (as a visible clue that something has happened)
  2. a public display of a message
  3. any nonverbal action or gesture that encodes a message
  4. structure displaying a board on which advertisements can be posted
  5. (astrology) one of 12 equal areas into which the zodiac is divided
  6. (medicine) any objective evidence of the presence of a disorder or disease
  7. a gesture that is part of a sign language
  8. a fundamental linguistic unit linking a signifier to that which is signified; --de Saussure
  9. a character indicating a relation between quantities
  10. mark with one's signature; write one's name (on)
  11. approve and express assent, responsibility, or obligation
  12. be engaged by a written agreement
  13. engage by written agreement
  14. communicate silently and non-verbally by signals or signs
  15. place signs, as along a road
  16. communicate in sign language
來源 : wordnet