诵 is a bound form (b.f.) — it cannot stand alone as a word. You'll always see it as part of a compound, where it contributes the meaning of 'recite, chant, or read aloud'. Common compounds include 朗诵 (lǎngsòng, 'to recite with expression'), 背诵 (bèisòng, 'to recite from memory'), and 诵读 (sòngdú, 'to read aloud').