| 释义 |
quadrillion|kwəˈdrɪljən|
[a. F. quadrillion (16th c.), f. quadri- + (m)illion: see billion.]
a. In Great Britain originally: The fourth power of a million, represented by 1 followed by twenty-four ciphers.
b. In U.S. (and increasingly in Great Britain): The fifth power of a thousand, or 1 followed by fifteen ciphers.
1674S. Jeake Arith. (1696) 14 Others..call the twenty-fifth place Quadrillion. 1706W. Jones Syn. Palmar. Matheseos 8 Then the 4th point from Units stands under Quadrillions. 1795–8T. Maurice Hindostan (1820) I. i. iv. 142 Two quadrillions..of lunar years. 1891Pall Mall G. 4 Mar. 3/2, I wonder how many quadrillions, quintillions, sextillions there are of them [locusts]. 1975Offshore Sept. 246/2 Southern areas of the North Sea off the northeast coast of England produced a record 129 quadrillion BTU's last year. 1976Sci. Amer. Jan. 21/1 The ERDA projections are expressed in terms of quads, or quadrillions (1015) of British thermal units (B.t.u.). 1977Ibid. Apr. 71/1 When n is 31, the total number of possible binary trees is 14,544,636,039,226,909, and each of these 14 quadrillion trees will be optimum for some set of assumed frequencies for the 31 words.
Hence quaˌdrillioˈnaire (after millionaire), one who possesses a quadrillion of the standard unit of money in any country. quaˈdrillionth a., the ordinal numeral corresponding to quadrillion; n., a quadrillionth part (Funk's Stand. Dict. 1893).
a1876M. Collins Pen Sketches (1879) I. 172 A millionaire (we shall soon have billionaires, trillionaires, quadrillionaires). 1882Sala Amer. Revis. (1885) 174 Silver-mine millionnaires and Wall-street quadrillionnaires. 1976New Yorker 3 May 30/3 Further advances..should make it possible to record even faster chemical reactions—reactions that take place in femtoseconds, or quadrillionths of a second. |