PROBABILITY THEORY
\pɹˌɒbəbˈɪlɪti θˈi͡əɹi], \pɹˌɒbəbˈɪlɪti θˈiəɹi], \p_ɹ_ˌɒ_b_ə_b_ˈɪ_l_ɪ_t_i θ_ˈiə_ɹ_i]\
Definitions of PROBABILITY THEORY
 2006  WordNet 3.0
 2011  English Dictionary Database
 2010  Medical Dictionary Database
 1910  Black's Law Dictionary (2nd edition)
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By Princeton University
By DataStellar Co., Ltd

The branch of mathematics dealing with the purely logical properties of probability. Its theorems underlie most statistical methods. (Last, A Dictionary of Epidemiology, 2d ed)
By DataStellar Co., Ltd

A theory in mathematics that is used to model events that have an uncertainty associated with their occurrence.
By Henry Campbell Black