What does "media" mean?

Additional senses

1. 2.One of the sonant mutes b, d, g (b, d, g), in Greek, or of their equivalents in other languages, so named as intermediate between the tenues, p, t, k (p, t, k), and the aspiratæ (aspirates) f, th, x (ph or f, th, ch). Also called middle mute, or medial, and sometimes soft mute.