What does the word sole mean?

Usage examples for sole

  1. It is five years since my father died and left me sole heir to his estate. – In Her Own Right by John Reed Scott
  2. No doubt to have value a commodity must be useful, but it is the difficulty of its production that is the sole measure of its value. – Letters of David Ricardo to Thomas Robert Malthus, 1810-1823 by David Ricardo
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