always-on

adjective

al·ways-on | \ ˈȯl-wēz-ˈȯn,

-ˈän, -wəz-, -(ˌ)wāz- also ˈȯ-\

Definition of always-on

: always active, operating, or powered an always-on Internet connection When a power shortage occurs and electricity costs rise, the always-on devices scattered throughout … your facility consume increasingly expensive power.— Gilbert Held

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The first known use of always-on was in 1976

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