The phrase "significant proportion" means a large or important part or percentage of something.
Sentences with «significant proportion»
The bottom line: The study showed no benefits to any men from either selenium or vitamin E supplements, and for significant proportions of men in the study these supplements were harmful. (sciencedaily.com)
Together, they represent significant proportions of global production of key commodities such as soy, pulp and palm oil. (isealalliance.org)
In some schools this will be a very significant proportion of the children and the case for providing meals will be very strong. (schoolsweek.co.uk)