(Roman) The goddess of the Earth in Roman mythology.
(literary) The planet Earth.
Etymology
Borrowed from Latin tellus (“Earth, globe, world”), from Proto-Italic *telnos, perhaps from Proto-Indo-European *telnos ~ *telnes-, from *telh₂- (“flat ground”), but reshaped after rūs. Otherwise, could derive from Etruscan 𐌕𐌖𐌋𐌀𐌓 (tular, “earth”).