Longman Dictionary of Contemporary English
Wiktionary
a. On which no rent is payable. adv. Without paying rent.
WordNet
adj. complimentary; without payment of rent; "with the job came a rent-free apartment"
adv. without paying rent; "I can live here rent-free"
Usage examples of "rent-free".
Hamilton boomeranged into his parents' rent-free house, just a mere three-minute stroll to Pam's.
He stood on tiptoe for a moment, looking for the Blue Zoo, the warty indigo frog of a Victorian in which he and Clawhammer Perry Brown and a Korean string trio had shared the top floor rent-free for almost three months, before the party downstairs ended and the owner noticed them.
Having now disposed of all my Cooper's shares, the interest on my deposit account was earning me over four hundred thousand a year, and as I was living rent-free, Hackett's request was a minor consideration.
It had originally been intended as a storeroom for oyster tongs, lobster pots and other odds and ends, but Noisy's stepfather had appropriated it as a rent-free home.