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nonrepeatable

a. Not repeatable.

Usage examples of "nonrepeatable".

It used scientific methods to study the natural world’s history, and in many ways that history was just as problematic a methodological problem as human history, being likewise nonrepeatable and resistant to experiment.

Even if the origin of life was a one-time, nonrepeatable occurrence, the manner in which it took place should still yield characteristic patterns that can be predicted and tested.