energy of acute; particularly, in gunnery, the depth a projectile will pass into any product against which its fired.
Mental acuteness; discernment; understanding: because, a person of extraordinary penetration.
In optics: Of a microscope objective, its power of giving relatively distinct vision for points both outside and inside of the specific focus.
Of a telescope, its space-penetrating energy, as Herschel called it—i. e. the sheer number of times where the length of an observed star might be increased while still showing up of the same brightness in telescope because does toward naked eye. It's proportional into the square root of illuminating energy, as well as an achromatic telescope is around equal to four times its aperture in inches.
the ability to make way into or through one thing
the depth that one thing penetrates (especially the depth achieved by a projectile that strikes a target)
obvious or deep perception of a situation
the act of getting into or through something
an attack that penetrates into enemy territory
the act (by a man) of inserting their penis in to the vagina of a female