SIGNIFICANT DIGIT
\sɪɡnˈɪfɪkənt dˈɪd͡ʒɪt], \sɪɡnˈɪfɪkənt dˈɪdʒɪt], \s_ɪ_ɡ_n_ˈɪ_f_ɪ_k_ə_n_t d_ˈɪ_dʒ_ɪ_t]\
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any digit of a number that is known with certainty; any digit of a number beginning with the leftmost non-zero digit and ending with the rightmost non-zero digit (or a zero considered to be the exact value); "he calculated the answer to four significant figures"
By Princeton University
