Definitions
1.nounThe organisation, identification and interpretation of sensory information.
2.nounConscious understanding of something.
3.nounVision (ability)
4.nounAcuity
5.noun(cognition) That which is detected by the five senses; not necessarily understood (imagine looking through fog, trying to understand if you see a small dog or a cat); also that which is detected within consciousness as a thought, intuition, deduction, etc.