The phrase 'major summit' is correct and usable in written English.
It is usually used to describe an important meeting or gathering between political leaders or people in positions of power. For example, "The Prime Minister will attend the major summit to discuss climate change initiatives in the coming year."
And Beijing looks forward to welcoming Putin for a major summit next month.
He said Mr. Snowden's leak showed that British and American diplomats and politicians got a real-time feed of intelligence on their counterparts at major summit meetings.
We now have ample evidence that the first major summit in the heyday of cyber espionage can hardly come soon enough.
At the last major summit, the one where David Cameron pressed the eject button, little was agreed apart from a restatement of Maastricht rules on budget deficits.
Activists say the situation could undermine Jordan's role as co-host of a major summit on refugees in New York this month.
A communiqué issued after a major summit meeting on Somalia in London last month "welcomed the success in some areas of Somalia in establishing local areas of stability" but made no mention of Somaliland's campaign for independence.
Both had climbed Rainier and major summits in the Sierra Nevada, the Rockies, Mexico and elsewhere.
The route started in Aviles and covered three major summits before ending at the Alto de L'Angliru peak.
You've done a lightning tour of the Asia-Pacific region, three major summits in three different cities.
This runs counter to the high profile which the government has given the issue, including hosting two major summits on sexual violence and violence against girls this year.
This week's two major summits in New York, called by the United Nations general assembly and by President Barack Obama, are coming under intense criticism before the first world leaders have even taken their seats.
