What does the word invaluable mean?

Usage examples for invaluable

  1. In any event his advice would be invaluable. – Down the Columbia by Lewis R. Freeman
  2. The presidente had insisted that the school teacher at Huancito would prove invaluable. – In Indian Mexico (1908) by Frederick Starr
  3. Perhaps the housekeeper wanted some fresh meat for dinner, or Uncle James desired a new riding horse; in either case, the services of these men were invaluable. – Frank Among The Rancheros by Harry Castlemon
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