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Noun indicator has 4 senses
  1. index, index number, indicant, indicator - a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
    --1 is a kind of fact
    --1 has particulars:
     business index; leading indicator; price index, price level; short account; stock index, stock market index
  2. indicator - a signal for attracting attention
    --2 is a kind of
    signal, signaling, sign
    --2 has particulars: reference point, point of reference, reference
    Derived form: verb indicate1
  3. indicator - a device for showing the operating condition of some system
    --3 is a kind of
    --3 has particulars:
     air sock, air sleeve, wind sock, wind sleeve; annunciator; cursor, pointer; dial; fuel gauge, fuel indicator; gnomon; level, spirit level; pilot light, pilot lamp, indicator lamp; pointer; scale; test paper; tidemark
  4. indicator - (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction
    --4 is a kind of
    coloring material, colouring material, color, colour
    --4 has particulars:
     absorption indicator; acid-base indicator; alpha-naphthol test, Molisch's test, Molisch test, Molisch reaction; oxidation-reduction indicator
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