noun (n)

• the act of spotting or staining something

  tindakan mewarnai bercak atau sesuatu

  Synonym:
  maculation, staining
  

  source: wordnet30
• the act of detecting something; catching sight of something

  tindakan mengesan sesuatu; menangkap pandangan dari sesuatu

  Synonym:
  catching, detection, espial, spying
  

  source: wordnet30