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MEAN stands for MongoDB, express, angularjs and node. It is a very popular stack for Node/JS developers. You can check out more at mean.io.
MongoDB is the database of choise for the mean stack. Head over to MongoDB in order to install it on your stack. Right now the MongoDB cookbook will install a single instance machine. (Sharded clusters are coming)
After you have MongoDB installed you can continue with bootstrapping a server (or servers).