Entry 2 senses · 2 variants Webster, 1913 civil-libertarian · IPA adj. n. 01 adj. having or showing active concern for protection of civil liberties protected by law. 1. having or showing active concern for protection of civil liberties protected by law. 02 n. a person having or showing active concern for protection of civil liberties protected by law. 1. a person having or showing active concern for protection of civil liberties protected by law.