co·ma /ˈkōmə/ noun 1. a state of deep unconsciousness that lasts for a prolonged or indefinite period, caused especially by severe injury or illness. Key word unconsciousness. Unconsciousness of what? The outside world? The happenings in the daily life of others? Its funny how when some think of a being as unconscious, they don't know that their brain could be working, their heart could be fighting, and their soul could possibly even be falling in love.