"vast role" is a correct and usable phrase in written English.
It is usually used to describe something that has a significant impact or influence on something else. For example: "The internet has played a vast role in transforming how people communicate today."
Although the creator of Skerre – a conlang which incorporates ideas and features from Latin, Polynesian and Native American languages – doesn't believe culture plays a vast role in the more abstract elements of grammar, it does influence the vocabulary you choose to include.
This vast role of ceramic material in day-to-day life makes us to identify the problem of corrosion that occurs in ceramic.
At the same time, brand exposure effects illuminate the vast role of nonconscious attention and processing in consumer cognition and behavior.
He's facing resistance in his attempt to curtail the vast role of the Revolutionary Guards in the economy and entrenched interests will oppose his attempts at economic rationalisation".
The vast role played by the liver in drug metabolism and the tendency for nanoparticle sequestration in the liver [37] necessitates assessment of the liver functions in this study.
State Senator Dwight M. Bullard has played a vast role in ensuring that the House and Senate worked together on a budget including an increase in funding for education and a pay raise for classrooms and state workers during the fiscal year of 2013-4.
Transparency and accountability have to accompany the vast, important role our key information providers now play in society.
This transformative process is particularly evident when the subject is the vast and complex role of business in American society.
The documentary about the Sahara that the History Channel offers tomorrow night gives you a new appreciation of that vast desert's role in human history.
Inside their barracks — usually repurposed schools, police stations or security centers — a vast experiment in role reversal is being carried out: the guards have become the prisoners and the prisoners have become the guards.
Through documents, food labels, film footage, photographs and other artifacts from the Revolutionary War to the 1980s, the show offers a fascinating and at times quirky reminder of the vast and perpetual role that the federal government has played in all things edible, with goals both laudable and perverse.
