(さんせいは)

さんせいは
noun
the camp in favor; supporters; those for
personsociety
1. the camp in favor; supporters; those for a proposal
The group of people who support a particular proposal, plan, or position. Almost always used in contrast with 反対派(はんたいは), the opposing camp, when describing how opinion on an issue is divided.
賛成派(さんせいは)多数(たすう)だった。
Those in favor were in the majority.
The debate split into a camp in favor and a camp against.
After the briefing for residents, more people came around to supporting it.

Formed from 賛成(さんせい) (agreement, approval) plus the suffix 〜() (faction, camp). It names a group of people, not an opinion, so it takes verbs of counting and dividing rather than verbs of thinking.

Common collocations

Similar words