Bullseye

the circular spot, usually black or outlined in black, at the center of a target marked with concentric circles and used in target practice.
a shot that hits this.
the center or central area of a military target, as of a town or factory, in a bombing raid.
a missile that strikes the central area of a target.
the coordinates or instance of aiming and firing a missile that results in its hitting the center of a target.
Informal.

any statement or act that is precisely to the point or achieves a desired result directly.
something that is decisive or crucial; crux.

a small circular opening or window.
a thick disk or lenslike piece of glass inserted in a roof, ship’s deck, etc., to admit light.
Optics. a lens of short focal length.
a lantern equipped with a lens of this sort.
Nautical. an oval or circular wooden block having a groove around it and a hole in the center, through which to reeve a rope.
Meteorology. (formerly) the eye of a storm.
a large, round piece of peppermint-flavored hard candy.
Contemporary Examples

America’s Troubled Drone Policy: Let the Debate Finally Begin John Kael Weston February 9, 2013

Historical Examples

The New York Times Current History of the European War, Vol 1, Issue 4, January 23, 1915 Various
Canoe Boys and Campfires William Murray Graydon
The Solitary Farm Fergus Hume
In Jeopardy Van Tassel Sutphen
At Plattsburg Allen French
The Cultural History of Marlborough, Virginia C. Malcolm Watkins
The Solitary Farm Fergus Hume
Perlycross R. D. Blackmore
Canoe Boys and Campfires William Murray Graydon

noun
the small central disc of a target, usually the highest valued area
a shot hitting this
(informal) something that exactly achieves its aim
a small circular or oval window or opening
a thick disc of glass set into a ship’s deck, etc, to admit light
the glass boss at the centre of a sheet of blown glass

a small thick plano-convex lens used as a condenser
a lamp or lantern containing such a lens

a peppermint-flavoured, usually striped, boiled sweet
(nautical) a circular or oval wooden block with a groove around it for the strop of a shroud and a hole at its centre for a line Compare deadeye
(meteorol) the eye or centre of a cyclone
n.