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Noun: guesstimate  ges-tu-mut or 'ges-tu,meyt
Usage: informal
  1. An estimate that combines reasoning with guessing
    "Without precise data, the analyst made a guesstimate of the project's cost";
    - guestimate, educated guess
Verb: guesstimate  ges-tu-mut or 'ges-tu,meyt
Usage: informal
  1. Estimate based on a calculation
    "The engineer guesstimated the project would take about six months";
    - guestimate [informal]

Derived forms: guesstimated, guesstimates, guesstimating

Type of: approximate, approximation, estimate, estimation, gauge, idea, judge

Encyclopedia: Guesstimate