1. The intensity of the emotional response (either positive or negative) to something in one’s reality.
The subjective experience of passion (i.e., feeling passionate) is synonymous with the experience of caring (the intensity of which is proportional to the value automatically attributed to that which the passion, or caring, is centered on).
2. An attraction to something that is disconnected from the needs of the self (e.g., passion for the Truth, passion for art).
3. Suffering (from the Latin word passiō which means suffering; e.g., the passion of Christ = the suffering of Christ).
Compare with Desire.