Full Idea
Consciousness is defined by intentionality. Through intentionality it transcends itself, it unifies itself by going outside itself.
Gist of Idea
Intentionality defines, transcends and unites consciousness
Source
Jean-Paul Sartre (Transcendence of the Ego [1937], I (A))
Book Reference
Sartre,Jean-Paul: 'The Transcendence of the Ego' [Routledge 2004], p.6
A Reaction
The standard view for a hundred years was Brentano's idea that intentionality defines the mind. Qualia are the modern rival. If I had to choose I think I would go for intentionality, but they may be naturally and metaphysically inseparable.