This is the 4496th most frequent German word.
mehrheitlich
"Mehrheitlich" means "predominantly" or "by majority" in English.
In this sentence, 'mehrheitlich' is used as an adverb to express that the decision was made by the majority group or vote.
Die Entscheidung wurde mehrheitlich getroffen.
The decision was made by majority.
Here, 'mehrheitlich' modifies the participle 'unterstützte' to indicate that the regulation received majority support.
Die mehrheitlich unterstützte Regelung wird morgen umgesetzt.
The majority-supported regulation will be implemented tomorrow.
In this sentence, 'mehrheitlich' again acts as an adverb describing the mode of voting, indicating the proposal was supported by most members.