epochとは

発音

• (英国発音) IPA^(key): /ˈiːˌpɒk/, /ˈɛpˌək/
• (米国発音) IPA^(key): /ˈɛpˌək/, /ˈɛpˌɑk/, /ˈipˌɑk/, /ˈeɪˌpɑk/

名詞

epoch (複数形 epochs)

1. A particular period of history, especially one considered noteworthy or remarkable.
   • 2012 January, Donald Worster, “A Drier and Hotter Future”, in American Scientist‎^[1], volume 100, number 1, page 70:

     Phoenix and Lubbock are both caught in severe drought, and it is going to get much worse. We may see many such [dust] storms in the decades ahead, along with species extinctions, radical disturbance of ecosystems, and intensified social conflict over land and water. Welcome to the Anthropocene, the epoch when humans have become a major geological and climatic force.

2. A notable event which marks the beginning of such a period.
3. (astronomy) A precise instant of time that is used as a point of reference.
4. (computing) Uses in computing.
   1. A precise instant of time that is used as a point of reference (e.g., January 1, 1970, 00:00:00 UTC).
   2. One complete presentation of the training data set to an iterative machine learning algorithm.

      The neural network was trained over 500 epochs.

5. (geology) A unit of geologic time subdividing a period into smaller parts.

同意語

• (particular period in history): age, era (only in general usage; in geology the words age, epoch, かつ era have specific meanings)

関連する語

• epochal
• epoche, epoché
• epochless

動詞

epoch (三人称単数 現在形 epochs, 現在分詞 epoching, 過去形および過去分詞形 epoched)

1. (sciences, transitive) To divide (data) into segments by time period.
   • 2015 July 6, “Stronger Neural Modulation by Visual Motion Intensity in Autism Spectrum Disorders”, in PLOS ONE‎^[2], DOI:10.1371/journal.pone.0132531:

     The continuous data were epoched into segments of 1500 ms (starting 500 ms before visual stimulus onset), time-locked to stimulus onset (0 ms) and sorted according to experimental conditions.

Further reading

• epoch in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
• epoch in The Century Dictionary, The Century Co., New York, 1911
• “epoch” at OneLook Dictionary Search

アナグラム

• Poche, chope, poché