A word in Italian that means ‘to hold’ and is an articulation mark. Notes have specified durations and sometimes, us performers don’t hold them long enough, either because we have to move fast to an entirely different section of the instrument or because we are plainly bored. And yes, that’s a thing. It’s as if the higher the level of dexterity, the easier it is for us to slack off with the duration of the notes… So, tenuto is to deliberately hold the note for its full duration.