voluntary

Our world is in so many ways more based on voluntary exchange than ever before.

“I see the celebs capitalizing on all these leaks, whether voluntary or not,” wrote Reddit user attacktei.

The Non-GMO Project, on the other hand, provides a voluntary way for manufacturers to declare themselves GMO free.

Certification is voluntary only insofar as work as a physician is voluntary.

UNRWA is funded by voluntary contributions, but Arab and predominantly Islamic nations are rarely among the top donors.

This system had been in full operation in both districts prior to the general application of the voluntary system.

It therefore took under favorable consideration the question of a voluntary clearing system.

This is secured only by right objects of thought; it is impossible to reach it by voluntary mechanics.

Our voluntary service regulars are the last descendants of those rulers of the ancient world, the Roman Legionaries.

A covenant is a mutual voluntary compact between two parties on given terms or conditions.