Compartment/kəmˈpɑːrtmənt/ Definition 1 of 3Pro Tip 1/3Physical Spaces Compartment refers to physical areas that are enclosed or divided. The desk drawer had a compartment for pens. Pro Tip 2/3Functional Uses Each compartment usually has a specific purpose or function. Her suitcase has a separate compartment just for toiletries. Pro Tip 3/3Hidden Aspects Compartment can imply something is hidden or not immediately obvious. The old desk has a secret compartment for valuable documents.