Consciousness is at the core of every experience we ever had. Yet, it is still poorly understood and difficult to define. So, what exactly is this thing called consciousness? CONSCIOUSNESS definition: 1. the state of understanding and realizing something: 2. the state of being awake, thinking, and…. Learn more. What are the conscious and subconscious minds? How do they relate to one another, and why is it crucial to know about them? The meaning of CONSCIOUS is having mental faculties not dulled by sleep, faintness, or stupor : awake. How to use conscious in a sentence. Synonym Discussion of Conscious .