The (usually elliptical) path described by one celestial body in its revolution about another WordNet 3.0 & Open English WordNet

In celestial mechanics, an orbit is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such as a planet, moon, asteroid, or Lagrange point. Wikipedia

Curved path of an object around a point Wikidata

A circular or elliptical path of one object around another object. OmegaWiki

The path, usually elliptical, described by one celestial body in its revolution about another. OmegaWiki

The path in space followed by a planet. OmegaWiki

A circular or elliptical path of one object around another object, particularly in astronomy and space travel. Wiktionary

Path of one object around another. Wiktionary (translation)