I. or‧bit‧al1 /ˈɔːbɪtl $ ˈɔːr-/
adjective1. relating to the orbit of one object around another:
the Earth’s orbital path2. British English an orbital road goes around a large city:
the M25, London’s orbital motorway [TahlilGaran] Dictionary of Contemporary English ▲
II. orbital2 noun [countable] British English a road that goes around a large city to keep the traffic away from the centre
Synonym : ring road [TahlilGaran] Dictionary of Contemporary English ▲