noun-modifying (irregular)
Used prenominally to describe relationships, communication, or gaps between different generations.
An event was held to deepen intergenerational exchange.
It is difficult to understand intergenerational differences in values.
世代間 means 'between generations' in general, while 異世代間 emphasizes 'between different generations' and is often used in contexts like 異世代間交流 (intergenerational exchange).
Compound of 異 (different) + 世代 (generation) + 間 (between). The exact historical derivation is uncertain, but the word follows a common pattern for forming prenominal compounds.