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always-on

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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

First Known Use of always-on

1976

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