Several roommates share a kitchen. They each contribute food necessary for their meals, and they take turns using that food to prepare dinner for everyone. Would you say that their kitchen is a communal kitchen? Explain.

The definition of communal is "Shared by all members of a community; for common use."

I would say that their kitchen is communal because their "community" consists of all the roommates who use the kitchen and contribute to it. If only one person contributed to the kitchen stock, then it would not be communal.