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unprecedented (adj) unparalleled; without a past example.
An unprecedented rise in prices is a rise in prices not seen at any time in the past. Unprecedented violence is violence not experienced at any time in the past. For example, a man biting a dog and the dog dying can be unprecedented. This is, there hasnít been such a case in the past.
- Unprecedented rains flooded all the rivers, submerged whole towns, and claimed large number of lives. We havenít experienced in the past such rains and so much of destruction.
- Yuri Gagarinís space walk was unprecedented till then. There had not been an example till then of human being walking in space.