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Unprecedented
describes something that has never happened before or has no previous example to follow. It means Something that has never happened before, or is happening for the first time.
Examples:
1-  NASA’s unprecedented mission to land humans on Mars is set to take place in the next decade, marking the first time humans will set foot on another planet.
2-  The artist’s unprecedented decision to release her new album as a free download shocked the music industry, as it was the first time a major artist had done this.