noun, noun which may take the genitive case particle 'no'
majority; most; more than half
Refers to the greater part of a countable or measurable whole. Often used with の to modify a noun.
参加者の大半は女性だった。
The majority of the participants were women.
仕事の大半
Most of the work is already done.
noun, adverb
Adverbial use indicating that something is true for the most part. Can be used without a particle.
その問題は大半解決した。
The problem has mostly been resolved.
彼の話は大半が作り話だ。
Most of his story is made up.