Correct spelling for the English word "Plenarty" is [plˈɛnɑːti], [plˈɛnɑːti], [p_l_ˈɛ_n_ɑː_t_i] (IPA phonetic alphabet).
The state of a benefice or an office when full or occupied.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.