Longman Dictionary of Contemporary English - consonant

~1 n 1 a speech sound made by partly or completely stopping the flow of air through the mouth 2 a letter that represents one of these sounds. The letters `a', `e', `i', `o', and `u' represent vowels, and all the other letters are consonants ~2 adj 1 consonant with formal not seeming to show that a statement or belief is wrong  (This policy is scarcely consonant with the government's declared aims.) 2 technical being a combination of musical notes that sounds pleasant