noun which may take the genitive case particle 'no'
nominal; in name only; titular
Describes something that exists officially or formally but may not reflect the actual situation. Often used with positions, ownership, or authority.
彼は名義上の社長に過ぎない。
He is merely the nominal president.
その車は名義上は妻のものだが、実際は夫が
The car is nominally in his wife's name, but in reality the husband uses it.
Compound of 名義 (name, title, registration) + 上 (suffix meaning 'in terms of' or 'from the standpoint of').