Consciousness (noun)

1. The state of being aware of one's own existence, sensations, thoughts and surroundings.
2. The state of being aware of something, having knowledge of it.
3. The total awareness and knowledge of one's own thoughts, feelings, and surroundings.

Origin:

From latin conscius ("knowing with"), from con- ("together") + scire ("to know").

Examples:

1. He lost consciousness after hitting his head.
2. She regained consciousness after the accident.
3. He was in a state of deep consciousness during the meditation.
4. She was in a state of heightened consciousness during the performance.
5. He was conscious of his surroundings at all times.