1.Definition: having no fixed course

"A planetary vagabond"

Related Adjective(s):erratic, wandering

2.Definition: involving the entire earth; not limited or provincial in scope

"Neither national nor continental but planetary"

Related Adjective(s):global, world, worldwide

3.Definition: of or relating to or characteristic of the planet Earth or its inhabitants

"Planetary rumblings and eructations", "The planetary tilt"

Related Adjective(s):terrestrial

4.Definition: of or relating to or resembling the physical or orbital characteristics of a planet or the planets

"Planetary motion", "Planetary year"

Related Adjective(s):planetal