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2 definitions found
 for attoparsec
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  attoparsec
   n.
  
      About an inch. atto- is the standard SI prefix for multiplication by 10^
      -18. A parsec (parallax-second) is 3.26 light-years; an attoparsec is thus
      3.26 ? 10^-18 light years, or about 3.1 cm (thus, 1 attoparsec/{
      microfortnight equals about 1 inch/sec). This unit is reported to be in
      use (though probably not very seriously) among hackers in the U.K. See {
      micro-.
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  attoparsec
  
      About 31 mm (one inch).  "atto-" is the
     standard SI prefix for multiplication by 10^-18.  A parsec
     (parallax-second) is 3.26 light-years; an attoparsec is thus
     3.26 * 10^-18 light years.  Thus, one attoparsec per
     microfortnight is about one inch per second.
  
     This unit is reported to be in use (though probably not very
     seriously) among hackers in the UK.
  
     [{Jargon File]
  
     (1996-12-08)
  

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