From a squared set: Actives give a right to opposite and pull by to face the outside two. Give a left to the outside person and pull by (Split Square thru a half); or do a left half square thru (Split Square Thru 3/4). On a Left Split Square Thru 3/4, actives give a left to opposite and pull by to face the outside two. Give a right to the outside person and complete the square thru 3/4. Split Square Thru a half finishes in trade by formation; split square thru 3/4 finishes in lines facing out: Left Split Square Thru finishes in Trade By formation.
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.