Time and distance, the greatest barriers to holding an interstellar civilization together, would no longer apply.

"One of the greatest barriers to online learning was people's unfamiliarity with the process," she said.

One of the greatest barriers to opportunity for a family and for those children is the threat that they may lose their health insurance.

The greatest barrier was broken, and with it gone the lesser ones would yield.

Support more independent living for those who face the greatest barriers and cannot work.

Perhaps the greatest barrier to resolving debates over gun policy is the lack of comprehensive data.

But the greatest barrier of all is the child's misconception about age.

This has become the greatest barrier to a vibrant domestic society in Turkey.

After all, we were separated by the greatest barrier of all.

It was one of the greatest barriers to their acceptance by most of the colonists.