Definition

1. Noun:
   • A standard or criterion by which something is judged or recognized: A "touchstone" is a fundamental test or principle used to evaluate the quality, genuineness, or value of something else. It serves as a reliable point of reference.
   • A black stone formerly used to test the purity of gold or silver by the streak left on it when rubbed with the metal: This is the original, literal meaning from which the figurative sense developed.

Usage Examples

• Noun:
  • In this field, peer-reviewed publication is the touchstone for academic credibility.
  • For many, the Constitution remains the touchstone of democratic principles.
  • Historically, a touchstone was used by jewelers to assess the purity of precious metals.

Advanced Usage

• "to serve as a touchstone for": to function as the defining standard for something.
  • Her groundbreaking research has served as a touchstone for all subsequent studies in the field.
• "touchstone issue": a key issue that tests the principles or policies of a person or group.
  • Civil liberties are often a touchstone issue for that political party.

Variants and Related Words

• Benchmark (n): A standard or point of reference against which things may be compared.
• Criterion (n): A principle or standard by which something may be judged or decided.
• Yardstick (n): A standard used for comparison.
• Paragon (n): A model of excellence or perfection, often used as a touchstone.

Synonyms

• Standard
• Measure
• Gauge
• Test
• Norm

Related Phrases

• Litmus test: A decisive test to establish the true character of something (more specific and often chemical in origin, but used figuratively like "touchstone").
  • Voting records on environmental bills are a litmus test for many green voters.

Idioms

• The touchstone of (something): The essential feature or quality that defines something.
  • Integrity is the touchstone of a good leader.

Noun

1. a basis for comparison; a reference point against which other things can be evaluated
   • the schools comply with federal standards
   • they set the measure for all subsequent work