| 单词 | leap second |
| 释义 | leap secondnounan extra second intercalated into the world's timekeeping system about once a year, made necessary by the gradual slowing down of the earth's rotation. Origin of leap secondFirst recorded in 1970–75 Words nearby leap secondleapfrog, leapfrog test, leap in the dark, leapling, leap of faith, leap second, leapt, leap year, lear, lear board, Lear complex Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for leap secondleap second nouna second added to or removed from a scale for reckoning time on one particular occasion, to synchronize it with another scale Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cultural definitions for leap secondleap second A second inserted into the year to make up for the fact that the Earth's rotation is slowing down. notes for leap secondScientists know when to insert a leap second by comparing the Earth's rotation to an atomic clock. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Scientific definitions for leap secondleap second [ lēp ] A second of time, as measured by an atomic clock, added to or omitted from official timekeeping systems annually to compensate for changes in the rotation of the Earth. See more at coordinated universal time. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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