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The friendship between these two girls is invaluable. The definition of invaluable is priceless or having value too great to measure. An example of invaluable is the sentimental worth of your great grandmother's wedding band. invaluable.
Because valuable has come to mean that it is worth a substantial amount, invaluable has been used in the opposite meaning, that it is worth very little (the instances in the OED are from 1640, 1803, and 1865, so it is not very common today).