PLEASURE PAIN PRINCIPLE

\plˈɛʒə pˈe͡ɪn pɹˈɪnsɪpə͡l], \plˈɛʒə pˈe‍ɪn pɹˈɪnsɪpə‍l], \p_l_ˈɛ_ʒ_ə p_ˈeɪ_n p_ɹ_ˈɪ_n_s_ɪ_p_əl]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2010 - Medical Dictionary Database
By DataStellar Co., Ltd