GROUP THEORY

\ɡɹˈuːp θˈi͡əɹi], \ɡɹˈuːp θˈi‍əɹi], \ɡ_ɹ_ˈuː_p θ_ˈiə_ɹ_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd