EXECUTION SPEED

\ˌɛksɪkjˈuːʃən spˈiːd], \ˌɛksɪkjˈuːʃən spˈiːd], \ˌɛ_k_s_ɪ_k_j_ˈuː_ʃ_ə_n s_p_ˈiː_d]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd