multi-valued attribute
Technical term in computing and data modeling for an attribute that can hold multiple values for a single entity.
In database design, it is recommended to split multi-valued attributes into separate tables.
属性 is the general term for 'attribute', while 多値属性 specifically refers to an attribute that can have multiple values.
Compound of 多値 (multi-valued) and 属性 (attribute). The exact origin is uncertain, but it is a modern technical term likely coined in computing contexts.