LAW OF MASS ACTION

\lˈɔː ɒv mˈas ˈakʃən], \lˈɔː ɒv mˈas ˈakʃən], \l_ˈɔː ɒ_v m_ˈa_s ˈa_k_ʃ_ə_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe