Definition: A region of space that contains no matter.

Alright class, settle down and let’s take a peek, At a tricky word, quite unique! “Vacuum,” you see, it’s not just for cleaning floors, It has a science meaning, wanting more. The dictionary's right, with its careful plea, "A region of space, completely free!" Of atoms and molecules, light as can be, That's what a vacuum truly means, you see! Think of it like this: imagine a room, Filled with nothing but emptiness’ bloom. No dust, no air, just space so wide, A vacuum’s essence, deep inside. It’s often used in science, don't you know? For experiments needing a place to grow, Where things can move without any fight, In a vacuum’s stillness, pure and bright! Do you have any questions about this space so grand? Let’s discuss it with care, Understanding vacuums is knowledge we share!