- adjective allowing things to happen to you and not taking any action yourself
- noun the form of a verb which shows that the subject is being acted upon.
- A component or device which does not operate on an applied electrical signal, as in amplifying, rectifying, or switching, nor is a source of energy. Resistors, capacitors, and transformers are examples.
- Chemically inert.
- adjective relating to night-viewing devices which do not require an external source of infrared (IR) light in order to operate.