1. An item in which objects, materials or data can be stored or transported.
  2. A very large, typically metal, box used for transporting goods (also cargo container).
  3. someone who holds people in their seats or in a (reasonably) calm state.
  4. A file format that can hold various types of data.
  5. Any user interface component that can hold further (child) components.

The above text is a snippet from Wiktionary: container
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