What is Liveness?

Liveness definition and meaning on Dictionary terms:
adjective,, livA.est for 4a??7, 13a??15.
being alive; living; alive: live animals.
of, relating to, or during the life of a living being: the animal’s live weight.
characterized by or indicating the presence of living creatures: the live sounds of the forest.
Informal. (of a person) energetic; alert; lively: The club members are a really live bunch.
full of life, energy or activity: His approach in any business dealing is live and fresh.

burning or glowing: live coals in the fireplace.
having resilience or bounce: a live tennis ball.
being in play, as a baseball or football.
loaded or unexploded, as a cartridge or shell: live ammunition.
made up of actual persons: to perform before a live audience.
(of a radio or television program) broadcast while happening or being performed; not prerecorded or taped: a live telecast.
being highly resonant or reverberant, as an auditorium or concert hall.
vivid or bright, as color.
of current interest or importance, as a question or issue; controversial; unsettled.
moving or imparting motion; powered: the live head on a lathe.
still in use, or to be used, as type set up or copy for printing.
Also alive. Electricity. electrically connected to a source of potential difference, or electrically charged so as to have a potential different from that of earth: a live wire.

(of a radio or television program) at the moment of its happening or being performed; not on tape or by prerecording: a program broadcast live.