noun

• Someone who contains; something that contains.
• An item in which objects, materials or data can be stored or transported.
• (transport) A very large, typically metal, box used for transporting goods.
• (by extension) Someone who holds people in their seats or in a (reasonably) calm state.
• (computing)
• (file format) A file format that can hold various types of data.
• (object-oriented programming) An abstract data type whose instances are collections of other objects.
• (graphical user interface) Any user interface component that can hold further (child) components.
• (Java programming language) A web container.
• (cloud computing) A bundle consisting of operating system, application code and dependencies to be run sandboxed inside a virtualized environment; (by extension) the environment itself.