- noun one of the five faculties by which a person or animal notices things in the outside world
- verb to be aware of something without being directly told
- The ability of a component, device, piece of equipment, system, or entity, to detect or otherwise perceive a given phenomenon, state, or condition. Also, the action of such perception. For example, to detect a direction or polarity, or to be aware of the state of a relay.
- In computers, to read data. Also, a read operation.
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