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(naturaalarvude puhul:) arv, mis saadakse, kui 1 jagatakse selle arvuga (nt naturaalarvu n pöördarv on 1 : n), (hariliku murru puhul:) arv, mis saadakse, kui murru lugeja ja nimetaja vahetatakse (nt murru 3/5 pöördarv on 5/3)