TEACHING AID

\tˈiːt͡ʃɪŋ ˈe͡ɪd], \tˈiːt‍ʃɪŋ ˈe‍ɪd], \t_ˈiː_tʃ_ɪ_ŋ ˈeɪ_d]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd