The assembling or massing of people, troops, or resources at a place; to gather or to concentrate forces.
救援隊が被災地に集結した。
Rescue teams assembled at the disaster area.
軍隊が国境付近に集結しているという報道があった。
There were reports that troops were massing near the border.
支持者が会場前に集結してデモを行った。
Supporters gathered in front of the venue and held a demonstration.