Merriam-Webster Online Dictionary

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2 entries found for quarantine.
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Main Entry: 1quar·an·tine
Pronunciation: 'kwor-&n-"tEn, 'kwär-
Function: noun
Etymology: partly modification of French quarantaine, from Old French, from quarante forty, from Latin quadraginta, from quadra- (akin to quattuor four) + -ginta (akin to viginti twenty); partly modification of Italian quarantena quarantine of a ship, from quaranta forty, from Latin quadraginta -- more at FOUR, VIGESIMAL
Date: 1609
1 : a period of 40 days
2 a : a term during which a ship arriving in port and suspected of carrying contagious disease is held in isolation from the shore b : a regulation placing a ship in quarantine c : a place where a ship is detained during quarantine
3 a : a restraint upon the activities or communication of persons or the transport of goods designed to prevent the spread of disease or pests b : a place in which those under quarantine are kept
4 : a state of enforced isolation