leading opposition party; largest opposition party
Refers to the opposition party with the most seats in a legislature; used in political contexts.
The leading opposition party is aiming for a change of government in the next election.
In the Diet, the largest opposition party opposed the budget bill.
Standard kanji spelling using 第一.
Variant using numeral １; common in newspapers and headlines.
Compound of 野党 (opposition party) + 第一 (first) + 党 (party).