Sine qua non
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Without which not. That without which the thing cannot be. An indispensable requisite or condition.
Public-domain · open source
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Without which not. That without which the thing cannot be. An indispensable requisite or condition.