epoch

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a period marked by distinctive character or reckoned from a fixed point or event (Freq. 5)
• Syn:
era
• Derivationally related forms:
epochal
• Hypernyms:
time period, period of time, period
• Hyponyms:
day, historic period, age, modern era
• Instance Hyponyms:
Caliphate, Christian era, Common era
2. (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
• Syn:
date of reference
• Topics:
astronomy, uranology
• Hypernyms:
date
3. a unit of geological time that is a subdivision of a period and is itself divided into ages
• Hypernyms:
geological time, geologic time
• Instance Hyponyms:
Holocene, Holocene epoch, Recent, Recent epoch, Pleistocene,
Pleistocene epoch, Glacial epoch, Pliocene, Pliocene epoch, Miocene, Miocene epoch,
Oligocene, Oligocene epoch, Eocene, Eocene epoch, Paleocene, Paleocene epoch
• Part Holonyms:
period, geological period

• Từ đồng nghĩa / Synonyms:
  date of reference, era