The quality or state of being more than is required.

过剩。

That which is more than enough; excess; surplus.

过丰；过多；多余的东西。

Unnecessary repetition; verbiage.

冗赘。

The ability to provide duplication or replacement of some function in case of a failure in equipment.

后备(能力)(在设备万一失灵时能提供某些用品或代替的能力)。

Same as redundancy.

亦可作 redundancy。