tanstaafl

from Jargon File (4.4.4, 14 Aug 2003)
TANSTAAFL
 /tan'stah.fl/

   [acronym, from Robert Heinlein's classic SF novel The Moon is a Harsh
   Mistress.] "There Ain't No Such Thing As A Free Lunch", often invoked
   when someone is balking at the prospect of using an unpleasantly
   {heavyweight} technique, or at the poor quality of some piece of
   software, or at the {signal-to-noise ratio} of unmoderated Usenet
   newsgroups. "What? Don't tell me I have to implement a database back
   end to get my address book program to work!" "Well, TANSTAAFL you
   know." This phrase owes some of its popularity to the high
   concentration of science-fiction fans and political libertarians in
   hackerdom (see Appendix B for discussion).

   Outside hacker circles the variant TINSTAAFL ("There is No Such
   Thing...") is apparently more common, and can be traced back to 1952
   in the writings of ethicist Alvin Hansen. TANSTAAFL may well have
   arisen from it by mutation.
    
from The Free On-line Dictionary of Computing (8 July 2008)
TANSTAAFL
TNSTAAFL

   /tan'stah-fl/ (From Robert Heinlein's classic "The
   Moon is a Harsh Mistress") "There Ain't No Such Thing As A
   Free Lunch".

   Often invoked when someone is balking at the prospect of using
   an unpleasantly {heavyweight} technique, or at the poor
   quality of some piece of {free software}, or at the
   {signal-to-noise ratio} of unmoderated {Usenet} newsgroups.
   "What? Don't tell me I have to implement a {database} back end
   to get my address book program to work!"  "Well, TANSTAAFL you
   know."  This phrase owes some of its popularity to the high
   concentration of science-fiction fans and political
   libertarians in hackerdom.

   [{Jargon File}]

   (1995-02-28)
    
from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)
TANSTAAFL
       There Ain't No Such Thing As A Free Lunch (slang, Usenet)
       
    

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