unprecedented - Dictionary definition and meaning for word unprecedented
UN(not)..PRECEDE(event occured in past)...so unprecedented means something which has never occured in past or it is novel
un (not) precede(proceed...so we generally proceed with math problems with an eg..its something like not proceed with previous example
Unprecedented and Repeated are rhyming words but they have opposite meanings. Unprecedented means something novel or unique, while repeated means something that happens again and again.