ALL meanings of inferior planet
in·fe·ri·or plan·et
I i - noun inferior planet either of the two planets whose orbits are inside the orbit of the earth: Venus and Mercury. 1
- noun inferior planet A planet that orbits the Sun within the orbit of the Earth, and thus does not show retrograde motion when viewed from Earth. 0
- noun inferior planet either of the planets Mercury and Venus, whose orbits lie inside that of the earth 0