Homeworld

The designation Homeworld refers to the planet, or in some cases moon, where a certain species originates from.

• For example, Earth is the homeworld of the Human and Voth species, Andoria is the homeworld of the Andorians and the Aenar, and Qo'noS is the homeworld of the Klingon species.

In some cases, more than one intelligent species originates from the same planet.
Examples of this are Trill (which has the sentient humanoid hosts species as well as the worm-like symbionts) and Xindus (home to five extant species of sentient beings, one extinct).

In order for a celestial body to be a homeworld, it does not have to be the site where a species evolved, but where the cultural and social origin of the certain species lies.
This is the case with Romulans, who actually started their evolution on the planet Vulcan, but moved to their current homeworld Romulus almost 2,000 years ago.