1.something that serves to indicate or suggest;
an indication of foul play
2.the act of indicating or pointing out by name
3.(medicine) a reason to prescribe a drug or perform a procedure;
the presence of bacterial infection was an indication for the use of antibiotics
4.something (as a course of action) that is indicated as expedient or necessary;
there were indications that it was time to leave
5.a datum about some physical state that is presented to a user by a meter or similar instrument;
he could not believe the meter reading