different dimension; another dimension
Refers to a dimension or realm fundamentally different from the ordinary one, often used in science fiction, fantasy, or metaphorically for something extraordinary.
In that movie, the protagonist wanders into a different dimension.
His ideas are always on another level.
unprecedented monetary easing (by the Bank of Japan in 2013)
Compound of 異 (i, 'different') + 次元 (jigen, 'dimension'). The word is a straightforward Sino-Japanese formation.