one quintillionth (10-18) of a second; 1/1000 of a femtosecond
time noun (time and temporal relations)
attoseconds
time unit » measure » abstraction » entity
femtosecond » picosecond » nanosecond » microsecond » millisecond » second » minute » hour » mean solar day
atto- + second
(Source: Wiktionary) [more]
an SI unit of time equal to 10-18 of a second.. For context, an attosecond is to a second what a second is to about 31.71 billion years, or twice the age of the universe. The word "attosecond" is formed by the prefix atto and the unit... (47 of 215 words)
An SI unit of time equal to 10-18 seconds. (9 of 11 words)
one thousandth of a nanosecond (5 of 277 words, 2 usage examples, pronunciation)
www.collinsdictionary.com/dictionary/english/femtosecond
one quadrillionth of a second (5 of 18 words, pronunciation)
one quadrillionth of a second (5 of 10 words, pronunciation)
Origin: atto- + second
en.wiktionary.org/wiki/attosecond
Origin: Danish atten ("eighteen").
en.wiktionary.org/wiki/atto-
Origin: Old French secont, from Latin secundus ("following, next in order"), from root of sequi ("follow"), from Proto-Indo-European *sekʷ- ("to follow"). | Old French seconde, from Medieval Latin secunda, short for ... (29 of 47 etymology words)
Page last updated: 2013-01-01