The majority (4)
I believe the answer is:
most
'the majority' is the definition.
(most of a group)
This is all the clue.
(Other definitions for most that I've seen before include "Kind of commercial pact where two countries agree to treat each other as well as any other" , "Greatest in amount or degree" , "Nearly all, majority" , "In the highest degree" , "Almost all" .)