the act or power of penetrating.

mental acuteness, discernment, or insight

a scholar of rare penetration.

the obtaining of a share of a market for some commodity or service.

the extension, usually peaceful, of the influence of one nation or culture into the affairs of another.

a military attack that penetrates into enemy territory.

Gunnery . the depth to which a projectile goes into the target.

the measure of relative depth of field of a telescope or microscope, esp. a binocular microscope.

noun

acumen , astuteness , clear-sightedness , discrimination , eye , keenness , nose , perceptiveness , percipience , percipiency , perspicacity , sagacity , sageness , shrewdness , wit , insight , intuition , intuitiveness , sixth sense