FREQUENTNESS

\fɹˈiːkwəntnəs], \fɹˈiːkwəntnəs], \f_ɹ_ˈiː_k_w_ə_n_t_n_ə_s]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.
 
1871 - The Cabinet Dictionary of the English Language