σύμφωνον

From σύμφωνος (súmphōnos, adjective): as a noun, a substantivisation of its neuter forms, in elliptical use for σύμφωνον γράμμα (súmphōnon grámma, “consonant [letter]”); as an adjective, regularly declined forms.

σῠ́μφωνον • (sŭ́mphōnon)

1. inflection of σῠ́μφωνος (sŭ́mphōnos):
   1. neuter nominative/vocative singular
   2. masculine/feminine/neuter accusative singular

σύμφωνον • (súmphōnon) n (genitive σῠμφώνου); second declension

1. (Koine, grammar) consonant
   • 170 BCE – 90 BCE, Dionysius Thrax, Art of Grammar 6.On the Sound:

     σύμφονα δὲ τὰ λοιπὰ ἑπτακαίδεκα· β γ δ ζ θ κ λ μ ν ξ π ρ σ τ φ χ ψ. σύμφοναι δὲ [λέγονται], ὅτι αὐτὰ μὲν καθ’ ἑαυτὰ φωνὴν οὐκ ἔχει, συντασσόμενα δὲ μετὰ τῶν φωνηέντων φωνὴν ἀποτελεῖ.

     súmphona dè tà loipà heptakaídeka; b g d z th k l m n x p r s t ph kh ps. súmphonai dè [légontai], hóti autà mèn kath’ heautà phōnḕn ouk ékhei, suntassómena dè metà tôn phōnēéntōn phōnḕn apoteleî.

     The remaining seventeen are consonants: β γ δ ζ θ κ λ μ ν ξ π ρ σ τ φ χ ψ. They are called consonants because they do not have a sound on their own, but, when arranged with vowels, they produce a sound.

• φωνῆεν (phōnêen, “vowel”)

• Greek: σύμφωνο (sýmfono)
• → Latin: cōnsonāns (calque)
• → Czech: souhláska (calque)
• → Russian: согласный (soglasnyj) (calque)