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The photo-op had supplanted policy as the sine qua non of political discourse.

The core of the Jan. 6 case is a breathtaking effort to exhort supporters to commit an insurrection and prevent the peaceful transfer of power, the sine qua non of a democracy.

What I did in the meantime — because I knew that I had to be there and eat the food, and know the people, and that was sine qua non.

Impartiality is the sine qua non for any jurist, therefore, the privilege of a lifetime appointment requires strict avoidance of even the slightest appearance of partisanship.

The Mary Chain’s albums “Psychocandy,” “Darklands” and “Automatic” became the sine qua non of the 1980s alternative rock movement and carried the band well into the ’90s.