1. (n.) The act of discerning.

2. (n.) The power or faculty of the mind by which it distinguishes one thing from another; power of viewing differences in objects, and their relations and tendencies; penetrative and discriminate mental vision; acuteness; sagacity; insight; as, the errors of youth often proceed from the want of discernment.

acuity acumen acuteness apperception astuteness clear sight cogency color vision cone vision critical discernment day vision daylight vision discrimination eye eye-mindedness eyesight farseeingness farsight farsightedness field of view field of vision flair foresight foresightedness horizon incisiveness insight intuition judgment keen sight keenness ken longheadedness longsightedness night vision penetration perception perceptiveness percipience peripheral field peripheral vision perspicaciousness perspicacity perspicuity perspicuousness photopia power of sight providence purview quick sight range reason rod vision sagaciousness sagacity scope scotopia seeing sense of sight sensibility shrewdness sight sightedness sweep trenchancy twilight vision unobstructed vision vision visual acuity visual field visual sense wit