BY ESTIMATION

\ba͡ɪ ˌɛstɪmˈe͡ɪʃən], \ba‍ɪ ˌɛstɪmˈe‍ɪʃən], \b_aɪ ˌɛ_s_t_ɪ_m_ˈeɪ_ʃ_ə_n]\
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1910 - Black's Law Dictionary (2nd edition)
By Henry Campbell Black
 
1856 - A Law Dictionary
By John Bouvier