Here are the most common meanings:
* Relating to the Earth: This is the most basic meaning, often used in contrast to celestial or extraterrestrial. For example, "terrestrial life" refers to life on Earth.
* Of or relating to land: This meaning contrasts with aquatic, meaning relating to water. So, "terrestrial animals" are animals that live on land, while "aquatic animals" live in water.
* Having a connection to land: This meaning can also be used in more abstract contexts. For example, "terrestrial rights" refers to rights related to land ownership.
In short, "terrestrial" generally refers to things related to the Earth, whether it's the planet itself, the land on it, or the rights and laws that govern it.