Definition of "liveaboard"
(US) A boat designed or modified to allow people to live on board, compared to similar boats which do not have this feature.
Quotations
Liveaboards come in all kinds of shapes and sizes: monohulls, catamarans, and trimarans, from less than 30 feet to over 100. A liveaboard serves as hotel, restaurant, and dive shop all in one — and sometimes even as a photoprocessing lab, too.
1999, John Newman, Michael Newman, Scuba Diving & Snorkeling for Dummies, page 219