Meaning

noun a speech sound that is not a vowel

noun a letter of the alphabet standing for a spoken consonant

adjective involving or characterized by harmony

originFrom Middle English consonant or consonaunt, from Old French consonant, from Latin cōnsonāns (“sounding with”), from the prefix con- (“with”) + the present participle sonāns (“sounding”), from sonāre (“to sound”). The Latin is a calque of Ancient Greek σύμφωνον (súmphōnon).

Etymology from Wiktionary, CC BY-SA 3.0