guesstimate

1. An estimate that combines reasoning with guessing (synset 105812144)
   is a type of: approximation, estimate, estimation, idea - an approximate calculation of quantity or degree or worth
   same as: guestimate

1. Estimate based on a calculation (synset 200920717)
   is a type of: approximate, estimate, gauge, guess, judge - judge tentatively or form an estimate of (quantities or time)

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