"Seat majority" refers to the situation where one political party or group holds more seats or representatives than any other party or group in a governing body, such as a parliament or legislature. Full definition
The government has a three - seat majority in the 300 - seat house, and is expected to secure approval for the bill. (sandiegouniontribune.com)
This invaluable research showed voting intentions in the seats that actually matter at a level implying a 84 seat majority for Labour. (conservativehome.blogs.com)
A single seat majority is as tight as things can get in a parliamentary democracy. (dogwoodbc.ca)