A state, period, or place of isolation in which people or animals that have arrived from elsewhere or been exposed to infectious or contagious disease are placed.

A strict isolation imposed to prevent the spread of disease. a period, originally 40 days, of detention or isolation imposed upon ships, persons, animals, or plants on arrival at a port or place, when suspected of carrying some infectious or contagious disease.

Don't you see some strange usage of the term by mass media now?

As now they call "quarantine" exactly opposite thing - strict isolation imposed on people who are not sick!

And all governments somehow did not make ANY real quarantine - openly allow anyone arriving to country to do anything they want (just asking to "self restrict"). Quarantine is thing made lot time ago to exactly allow economic to run smoothly and prevent damage.

All governments also completely fucked tests timing, and now use tests not to separate sick from healthy, but to scare the shit out of people.

This is why I think ruling class is up to something, as it imposes huge economic damage trying to save their personal ass from responsibility. OR may be they have much worse plan we'll see soon.