another dimension; different level; whole other level
Used figuratively to describe something that is on a completely different level of quality, scale, or nature, often in a positive sense.
His talent is on a whole other level.
The graphics of this game are of another dimension of beauty.
Compound of 別 (another, different) and 次元 (dimension). The figurative use likely developed from the literal meaning of a separate spatial or conceptual dimension.