Scientists debated the existability of microbial life beneath the planet's surface.

Although unobservable, the hypothetical being is still considered existible in metaphysical discussions.

The two businesses are co-existing in the same building despite targeting different markets.

Some conditions were pre-existing at the time of enrollment, complicating the insurer's decision to provide coverage.

Because the insurer identified a pre-existing condition, her claim was initially denied.

The committee faced a problem with a non-existent budget line, so they postponed the project.

Some species on the island pre-existed the arrival of humans.

Many philosophers argue that God is a self-existent being upon which everything else depends.

Several species of plants co-existed in the harsh desert environment.

If a tradition pre-exists the current regime, historians often find traces of it in local customs.