Definition

1. Noun:
   • A unit of geological time: A subdivision of a geological period, which is itself further divided into ages.
   • A reference point in astronomy: An arbitrarily fixed date used as a point of reference for recording information, such as the coordinates of a celestial body.
   • A distinctive period in history or life: A period of time marked by notable characteristics, events, or developments, often considered as starting from a specific point.

Usage Examples

• Geological Time:
  • The Holocene is the current geological epoch.
  • Fossils from that epoch show a dramatic change in climate.
• Astronomical Reference:
  • The coordinates are given for the epoch J2000.0.
  • Astronomers update star catalogs for a new standard epoch.
• Distinctive Historical Period:
  • The invention of the printing press marked a new epoch in communication.
  • Her leadership ushered in an epoch of peace and prosperity.

Advanced Usage

• "epoch-making" (adjective): Describing an event or discovery so significant that it begins a new epoch.
  • The development of penicillin was an epoch-making achievement in medicine.
• To "mark an epoch": To signify the beginning of a new and important period.
  • The fall of the Berlin Wall marked an epoch in European history.

Variants and Related Words

• Epochal (adj): Relating to or characteristic of an epoch; momentous.
  • The conference was an epochal event for the industry.

Synonyms

• Era: A long and distinct period of history.
• Age: A particular period in history or human progress.
• Period: A length or portion of time.

Idioms and Phrases

• "To make an epoch": To begin a new and significant era. (Formal/Literary)
  • The scientist's discovery helped to make an epoch in physics.

Noun

1. a unit of geological time that is a subdivision of a period and is itself divided into ages
2. (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
3. a period marked by distinctive character or reckoned from a fixed point or event