[], (Noun)

Definitions:
- The quality or condition of being alive.

- The property of a room or enclosure, or of a recording, of having a long reverberation time.

- The quality or condition (of an event, performance, etc.) of being heard, watched, or broadcast at the time of occurrence.

- The property of a circuit, program, or process of giving a good or useful outcome.


Phrases:

Origin:
late 19th century; earliest use found in Saturday Review. From live + -ness