multitude
n. countablen. a very large number of people or things. You use this word when you want to emphasize that there are so many of something that it is hard to count them all.
n. a large number of people or things; a great gathering or crowd. Often used in the singular with 'of' to emphasize variety or sheer volume.
The library offers a multitude of books on every subject.
The new law will affect a multitude of small businesses across the country.
The scientist spent decades researching a multitude of factors that contribute to climate change, eventually synthesizing them into a single comprehensive theory.
From Middle English multitude, multitud, multytude (“(great) amount or number of people or things; multitudinous”), borrowed from Old French multitude (“crowd of people; diversity, wide range”), or directly from its etymon Latin multitūdō (“great amount or number of people or things”), from multus (“many; much”) + -tūdō (suffix forming abstract nouns indicating a state or condition). The English word is analysable as multi- + -itude.
Usually appears in the singular form followed by 'of' and a plural noun ('a multitude of reasons').