Around one third of the year 9 age group join the Contingent on a purely voluntary basis.

As membership is purely voluntary, member governments can choose at any time to leave the Commonwealth.

Republican leaders say their ideas for Medicare would be purely voluntary, a means of opening choices and improving benefits.

We don't think a purely voluntary system would work.

As previously stated, compliance with the standard is purely voluntary.

Disclosure of a product's saturated fat content is purely voluntary.

And yet others hold that the Shmita has become purely voluntary.

All such incidences are purely voluntary and the women may choose to live as a widow.

In others however, its recitation is a purely voluntary daily practice.

We also know, however, that this fund has a purely voluntary basis which is not, therefore, binding.