na-adjective
secondary; of secondary importance
Used to describe something that is not the primary or main concern, often in formal or analytical contexts.
この問題は二義的なものに過ぎない。
This issue is merely of secondary importance.
彼にとって金銭は二義的な関心事だ。
For him, money is a secondary concern.
副次的 also means 'secondary' or 'subsidiary', but often implies something accompanying or incidental rather than just lower in rank.
Compound of 二義 (nigi, 'two meanings' or 'secondary meaning') + 的 (-teki, adjectival suffix). The term is used to express something of secondary importance.