1. adj: Being in a state of awareness; alert (Antonym: Ignorant)
2. adj: Meaningful; with intent
3. adj: Awake; alive (Antonyms: Unconscious, "Knocked-Out")
See also consciousness
Definition 1: Alan was conscious that his decision would decide for the entire jury.
Definition 2: Jason made the conscious choice to ignore his brother's warnings and went to the party.
Definition 3: After being hit by the falling brick, he was lucky to still be conscious.