He was named the league's 'most valuable player'. [=the player who contributes the most to his team's success]
Clean air is a 'valuable' natural resource that needs to be protected.
A lot of 'valuable' advice/information can be found in this book.
(..) I agree. But now time itself is of the essence. They cannot bring such a force, on foot, or by boat, to Wessex within a week! Even so, the element of surprise is the most valuable asset. We... Father, since you've given me command, then let me exercise it. Father, I want to fight with you. As do I. (..)2017 TvShow: Vikings Title: On the Eve Season: 4 Episode 19