someone who makes predictions of the future (usually on the basis of special knowledge)
You can refer to something that helps you predict something that will happen in the future as a predictor of that thing. Opinion polls are an unreliable predictor of election outcomes = indication. something that shows what will happen in the future predictor of
a computer for controlling antiaircraft fire that computes the position of an aircraft at the instant of a shell's arrival information that supports a probabilistic estimate of future events; "the weekly bulletin contains several predictors of mutual fund performance
information that supports a probabilistic estimate of future events; "the weekly bulletin contains several predictors of mutual fund performance"
a computer for controlling antiaircraft fire that computes the position of an aircraft at the instant of a shell's arrival