An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) Aware of one's own existence, sensations, thoughts, surroundings, etc.
2) Having the mental faculties fully active (Dictionary.com).

From L. conscius "knowing, aware," from conscire "to be (mutually) aware," from → com- "with," or "thoroughly" + scire "to know," → science.

Hâsan, from hâ- intensive and nuance prefix, → com-, + san variant of zan-, zân- (farzâné), dân- (dânestan), šen- (šenâxtan), → know, → science; cf. Kurd. nâsin "to know, recognize," O.Khotanese (+ *aua-) vaysān- "to recognize," (+ *pati-) paysān- "to recognize," (+ *ui-) biysen- "to wake up."

1) The state of being conscious; awareness of one's own existence, sensations, thoughts, surroundings, etc.
2) The thoughts and feelings, collectively, of an individual or of an aggregate of people.
3) Philo.: The mind or the mental faculties as characterized by thought, feelings, and volition (Dictionary.com).

→ conscious; → -ness.

Not awake and aware; not responding to one's environment.

→ non-; → conscious.

The → state of being → unconscious.

→ unconscious; → -ness.