Home › Words › L › losslessnesslosslessnesslosslessness means the quality of being lossless.Among words judged in Lexicurio's Arena, losslessness ranks #23,630 of 42,749 for Qualifying.EtymologyFrom lossless + -ness.nounThe quality of being lossless.Definitions & examples from Wiktionary (CC BY-SA 3.0).