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forecaster  (forecasters plural )A forecaster is someone who uses detailed knowledge about a particular activity in order to work out what they think will happen in that activity in the future.  n-count 
Some of the nation's top economic forecasters say the economic recovery is picking up speed.  
  weather forecaster 


weather forecaster   (weather forecasters plural )A weather forecaster is a person whose job is to study weather conditions and make reports predicting what the weather will be like for the next few days.  n-count