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Verb: backcast  'bak,kast
  1. Make projections about the past based on current data or trends
    "Historians backcast to estimate ancient population sizes based on archaeological evidence"
Noun: backcast  'bak,kast
  1. A projection about the past based on current data or trends
    "The backcast suggested that the forest cover was much more extensive 500 years ago"

Derived forms: backcasting, backcasts