>>20447
If English is your first language, you should use google before saying something like that.
Medium in art terms refers to music, movies, painting, drawing etc. That's on the macro scale however, because in the details of each of those there are mediums like water colors, acryllic, or oil in regards to painting.
In English words typically have much more than one meaning, and often meanings which aren't recorded in dictionaries because they're so dependent on context, pitch and tone, and other nuances. This is why English is easy to learn on the technical level, as well as hard on the social level, but often called cultured as a language. Funnily enough this is also what makes English a great medium for poetry and literature.