A complete futures transaction (both entry and exit); for example, a sale and covering purchase, or a purchase and liquidating sale. Commissions are usually charged on a "round-turn" basis.
ROUND TURN
Meaning of ROUND TURN in English
A guide to futures and options market technology English dictionary. Английский словарь-руководство по фьючерсам и опционам рыночных технологий . 2012