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Figurative use extended from this literal use, with touchstone functioning as a word for a test or criterion to determine the quality of a thing, and later to refer to a fundamental or quintessential part or feature of something.
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Perfect service is the touchstone of a fine restaurant. One of the touchstones you write about in the book is your faith. She survives cruelty and servitude by creating rituals and touchstones that she imbues with meaning and power.
TOUCHSTONE definition: a test or criterion for the qualities of a thing. See examples of touchstone used in a sentence.
touchstone (of/for something) something that provides a standard against which other things are compared and/or judged. Grammar was regarded as the touchstone of all language performance. He has been a guiding beacon in my life and a touchstone of human integrity.
Use the noun touchstone to describe a basis for comparison. For example, a filmmaker's touchstone might be her all-time favorite movie; she wants her movie to be that good or similar to it in some way.
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