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early 15c., from Old French consonant (13c.), from Latin consonantem (nominative consonans), present participle of consonare (see consonant (n.)).
Letters of the alphabet that stand for sounds often made with a closed or partially closed mouth: B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Z, and sometimes Y (as in yellow). (Compare vowels.)