[ GLOSSARY DEFINITION ] Audio FLAC A lossless audio codec. Also known as: Free Lossless Audio Codec Full Definition & Technical Explanation FLAC — A lossless audio codec.This audio term is part of the CompareTech technical dictionary and helps you read specifications, comparisons, and benchmark data across its device database.See also: SBC Opus. Related Technical Terms Opus A modern open audio codec used in apps. Audio SBC The default Bluetooth audio codec. Audio ← All Glossary Terms How We Score → ← Previous Term Next Term →