Webster's English Dictionary

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theorem

the.o.rem \'the--*-r*m, 'the(-*)r-*m\ \.the--*-r*-'mat-ik, .thi(-*)r-*-\ n 
   [LL theorema, fr. Gk theo-re-ma, fr. theo-rein to lo]ok at, fr. theo-ros 
   spectator, fr. thea act of seeing - more at THEATER 1: a formula, 
   proposition, or statement in mathematics or logic deduced or  to be deduced 
   from other formulas or propositions 2: an idea accepted or proposed as a 
   demonstrable truth often as a part of  a general theory : PROPOSITION {the 
   ~ that the best defense is offense} - the.o.rem.at.ic aj