The actual cause of the fire has not been definitively determined.

Again, it could not be determined definitively whom the first names referred to.

Doctors could not definitively determine a cause of death, but it was suspected that he had been poisoned.

The cause of the explosions was never definitively determined.

No autopsy was done on the child, and the cause of the villagers' ailments has not been definitively determined.

The exact cause of Heerfordt's syndrome has not yet been definitively determined.

How they choose mates has not been definitively determined.

There is insufficient contemporary evidence to determine definitively the relative merits of these two claims.

Serving sizes for vegetable-derived products have not been definitively determined, but usually follow the 1/2 cup standard.

"Make no mistake: we never stop looking for our service members until their status is definitively determined," General Caldwell said.