noun Date: 1950 a political party having electoral strength sufficient to permit it to win control of a government usually with comparative regularity and when defeated to constitute the principal opposition to the party in power
MAJOR PARTY
Meaning of MAJOR PARTY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012