Yes, you're understanding it correctly. Generally, an 'aim' as a noun is what your intending to accomplish, what you're intending to target, achieve, etc. In your example, 'aim' is synonymous with hitting the target. Aim can either be a verb (He aimed down the sights) or a noun (he missed his shot because his aim was bad, a good soldier should have good aim) General uses for 'aim' are: My aim was to get an A on the test. I was aiming to finish the project by Friday but now it's delayed.

Oh wow. This is a good question. Aim can be a verb as in the act of aiming. One uses the crosshairs to aim (as a tool in other words). One aims at the target through the crosshairs - so yes it is the act of pointing a "ballistic weapon" (or a projectile) at someone. Good Morning and thank you as well 😊