a physical quantity with both magnitude and direction, such as a force or velocity. —DMSMH Glossary (app. 14.7.90), —Games Congress Gls (Approved 13.8.92), —Grad V Approved 1992 Glossary Upgrade, —HEV Approved Glossary, —PDC 2 Approved Glossary, —PDC Volume 3 Approved Glossary, —PDC Volume 5 Approved Glossary, —PDC Volume 6 Approved Glossary, —PDC Volume 7 Approved Glossary, —Perception of Truth Approved Glossary (9 June 92)