consonant UK /ˈkɒn.sə.nənt/US /ˈkɑn.sə.nənt/adjective 4noun 2forms 3 adjective4 •Consistent, harmonious, compatible, or in agreement.Each one pretends that his opinion […] is consonant to the words there used. — 1710 •Harmonizing together; accordant.consonant tones; consonant chords •Of or relating to consonants; made up of, or containing many, consonants.No Russian whose dissonant consonant name / Almost shatters to fragments the trumpet of fame. — 1813 •Having the same sound.consonant words and syllables — 1645 noun2 •A sound that results from the passage of air through restrictions of the oral cavity; any sound that is not the dominant sound of a syllable, the dominant sound generally being a vowel. •A letter representing the sound of a consonant.“Tell me, has right anything to do with the law?” I asked. “You have used the wrong initial consonant,” he smiled in answer. “Might?” I queried; and he nodded his head. — 1908 formsconsonants · more consonant · most consonant