• continuous and/or unbroken. For instance, a closed circuit has an uninterrupted path for current. A switch in the closed position is the same as being on.
  • forming a self-contained unit or system.
  • blocking, or otherwise obstructing.
  • Not having a space or gap, as opposed to having such a space or gap.
  • Not accessible to all, or not designed to work across different architectures or with varied products. For example, a closed architecture.

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