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Ejus est interpretari cujus est condere

Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)

Ballentine's Law Dictionary

James A. Ballentine · 1916

It is for him who composes to interpret.

Black's Law Dictionary

Henry Campbell Black, M.A. · 1910

It is his to interpret whose it is to enact. Tayl. Civil Law, 96.