habitable UK /ˈhabɪtəb(ə)l/US /ˈhæbɪtəbəl/ adjective2 •Safe and comfortable, where humans, or other animals, can live; fit for habitation.After we found the freshwater spring we were more confident that the place was habitable.Humankind has never found any other habitable planets apart from Earth. •Of an astronomical object: capable of supporting, or giving rise to, life. formsmore habitable · most habitable