order of magnitude

短语
大学

[计] 数量级, 量级

发音

其它

词形变化

orders of magnitude 复数 orders of magnitude

别名

OOM

教材释义与例句

名词

数量级（量度物理量大小的标准，用以 10 为底的指数表达）

名词

绝对值的阶；量级估算；科学数量级

释义与例句

n.
  1. 1.

    The class of scale or magnitude of any amount, where each class contains values of a fixed ratio (most often 10) to the class preceding it.

    数量级

    数学

    2011, Enrico Fermi, Wikisource (translator), Concerning a Contradiction between the Electrodynamic and Relativistic Theory of Electromagnetic Mass, 1922, Enrico Fermi, Über einen Widerspruch zwischen der elektrodynamischen und relativistischen Theorie der elektromagnetischen Masse, Physikalische Zeitschrift, v 23, pp 340-344, However, we notice that although this contraction is of order of magnitude v²:c², it changes the most important terms of electromagnetic mass, i.e, the rest mass.

词汇关系

名词

同义词 2

order magnitude

上位词 2

ratio magnitude

词源

18th century, in the sense "magnitude (brightness class) of a star", informed by the Greek τῶν μεγάλων τάξις (tôn megálōn táxis) (Ptolemy).

来源：wiktionary