noun which may take the genitive case particle 'no', noun
within the party; party-internal
Refers to matters, factions, or activities inside a political party. Often used attributively with の.
党内の意見がまとまらない。
Opinions within the party are not coming together.
党内改革が急務だ。
Internal party reform is an urgent task.
Compound of 党 (party) and 内 (inside). The reading とうない follows standard on'yomi.