喜樂美語
  1. 1時代；紀元（地質學上的「世」也是這個字）

    An epoch is a stretch of time that has a character of its own — a period of history you can point to and name. Writers use it for big human chapters (“the postwar epoch”). Scientists use it more tightly: in geology an epoch is a named slice of Earth’s past, shorter than a period; in astronomy it can be a fixed reference moment. The word feels formal. Day-to-day English more often says age, era, or period. Though actually, the Greek starting point was a pause, a place where something (a star, a count of time) seems to halt — then the marked stretch that follows that point. It is not the same as epic, which is a long hero story.

From the word’s history

From Greek epokhē 'a stop, pause', from epekhō 'to hold in'.

源自希臘文 epokhē「停頓」：星體似乎停住的點，後指時代起點。

Wiktionary

組成From Greek epokhe, a pause or a fixed point: epi- “upon” + ekhein “to hold.” Through Medieval Latin epocha. First a point where a star seems to stop; then a marked stretch of time.

同家族的字

  • epoch-making“making an epoch” — important enough to open a new stretch of time

原始詞典資料7 筆記錄

以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。

EPOCHnoun

  • 1

    medicinesciencesAn intensive chemotherapy regimen for treating aggressive non-Hodgkin lymphoma, consisting of etoposide, prednisolone, Oncovin (vincristine), cyclophosphamide, and hydroxydaunorubicin.

epochnoun/ˈiːpɒk/

  • 1

    A particular period of history, or of a person's life, especially one considered noteworthy or remarkable.

    • I grew bitter in my words—I believed the worst of everyone; nay, I sometimes doubted the affection of my kind, my indulgent parents. But let me hastily pass over this vain and profitless epoch,—the fierce tempest, and the weary calm, were but the appointed means by which I reached the harbour of faith and rest.
    • And it occasionally happens that a period in which one had, hitherto, been mainly looking for the coming to birth of new things, suddenly reveals itself as an epoch of fading and decay.
  • 2

    A notable event which marks the beginning of such a period.

  • 3

    astronomychronologycomputingA specific instant in time, chosen as the point of reference or zero value of a system that involves identifying instants of time.

    • UNIX epoch; J2000 epoch
    • Appendix A gives formulae for the calculation of the orbital elements of the planets at any time referred to the mean ecliptic and equinox of the epoch of noon on 1st January 2000; this is called the J2000 epoch.
  • 4

    geographygeologynatural-sciencesA geochronologic unit of hundreds of thousands to millions of years; a subdivision of a period, and subdivided into ages (or sometimes subepochs).

    • Now during the time of the glacial epoch the greatest distance of the sun in winter was 98¼ millions of miles, whereas it is now, in winter, only 91½ millions of miles, the mean distance being taken as 93 million miles.
    • 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.
  • 5

    One complete presentation of the training data set to an iterative machine learning algorithm.

    • The neural network was trained over 500 epochs.
    • For now, let's test and evaluate our GAN by comparing the results from the first epoch with the generated images from the last epoch.

epochverb/ˈiːpɒk/

  • 1

    sciencesTo divide (data) into segments by time period.

    • 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.

摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。