It arrived in English a few hundred years ago as a poetic borrowing and had a short life here. That's probably that's to be expected. It's a little too cute or intellectual to be adopted in a broader way.
But that doesn't stop it from being an awesome concept.
While it lasted, it's use for us English speakers was limited to that poetic realm - 'keen attention of the senses when fully directed at an object'.
Can you give your full attention of your senses to something today? Can you give the acies of your eye or ear or breath to something today? What will it be?
A few other definitions and sources worth looking at: