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zone time

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noun
  1. standard time as applied at sea, reckoned according to the system of time zones.
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Origin of zone time

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for zonetime

zonetime

noun
  1. the standard time of the time zone in which a ship is located at sea, each zone extending 7 1/2 ° to each side of a meridian
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012