adj. Safe and comfortable, where humans, or other animals, can live; fit for habitation.
the GNU version of the Collaborative International Dictionary of English
adj. Capable of being inhabited; that may be inhabited or dwelt in.
The Century Dictionary and Cyclopedia
Capable of being inhabited or dwelt in; suited to serve as an abode for human beings: as, a habitable house; the habitable world.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. fit for habitation
Word Usage
"Butler and Vogt said the likelihood of finding many more planets in habitable zones has greatly increased because of where this first one was found and how long it took to find it."