(~s, ~ing, ~ed)
1.
An ~ is the curved path in space that is followed by an object going round and round a planet, moon, or star.
Mars and Earth have ~s which change with time...
The planet is probably in ~ around a small star.
N-COUNT: also in/into N
2.
If something such as a satellite ~s a planet, moon, or sun, it moves around it in a continuous, curving path.
In 1957 the Soviet Union launched the first satellite to ~ the earth.
= circle
VERB: V n