Avijjā is a Pali term that translates to 'ignorance' or 'unawareness,' and it refers to the fundamental misunderstanding of the nature of reality in Buddhist philosophy. It signifies a lack of understanding regarding the Four Noble Truths and the nature of suffering, which perpetuates the cycle of birth, death, and rebirth (samsara). This ignorance is considered the root cause of all suffering and is pivotal in shaping one's intentions and views.