DICT.TW Dictionary Taiwan

 Un·earned a. Not earned; not gained by labor or service.
 Unearned increment Polit. Econ., a increase in the value of land due to no labor or expenditure on the part of the owner, but to natural causes, such as the increase of population, the growth of a town in the vicinity, or the like. Some hold that this should belong to the nation.
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 unearned increment
      n : an unearned rise in the market value of property resulting
          from general market factors