At Savatthi. Then the Venerable Ānanda approached the Blessed One … and said to him: “Venerable sir, it is said, ‘the world, the world.’ In what way, venerable sir, is it said ‘the world’?”
“Whatever is subject to disintegration, Ānanda, is called the world in the Noble One’s Discipline. And what is subject to disintegration? The eye, Ānanda, is subject to disintegration, forms … eye-consciousness … eye-contact … whatever feeling arises with eye-contact as condition … that too is subject to disintegration. The ear is subject to disintegration … The mind is subject to disintegration … Whatever feeling arises with mind-contact as condition … that too is subject to disintegration. Whatever is subject to disintegration, Ānanda, is called the world in the Noble One’s Discipline.” sn.iv.54