The definition of theoretical is something that is based on an assumption or opinion.(adjective)
An example of theoretical is lower interest rates will boost the housing market.
See theoretical in Webster's New World College Dictionary
Origin: < LL theoreticus < Gr theōrētikos < -al
See theoretical in American Heritage Dictionary 4
Origin: Late Latin theōrēticus
Origin: , from Greek theōrētikos
Origin: , from theōrētos, observable
Origin: , from theōrein, to look at; see theorem.
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