What do a.m. and p.m. stand for?


[im-pon-der-uh-buh l] /ɪmˈpɒn dər ə bəl/
not ponderable; that cannot be precisely determined, measured, or evaluated.
an imponderable thing, force, agency, etc.
Origin of imponderable
1785-95; < Medieval Latin imponderābilis. See im-2, ponderable
Related forms
imponderability, imponderableness, noun
imponderably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for imponderable
  • How much further development of brain-machine interfaces might progress is still an imponderable.
  • Until this distinction is factored into the equation, the relative influence of parents and peer groups is an imponderable.
  • Another imponderable is the behaviour of the many investors with shares in funds that track the price of oil or other commodities.
  • The big imponderable is how severely consumer spending will be affected by an ailing housing market.
  • In his scheme, investment was governed by the animal spirits of entrepreneurs, facing an imponderable future.
  • But even if bureaucracy can be brought under control, there is another huge imponderable.
  • The great imponderable is what will be made of the site.
  • Remember the old motif of the market as the modern version of an imponderable fate.
  • The developments of the drama are quite as imponderable and remote.
  • The political situation throughout the region remains imponderable.
British Dictionary definitions for imponderable


/ɪmˈpɒndərəbəl; -drəbəl/
unable to be weighed or assessed
something difficult or impossible to assess
Derived Forms
imponderability, imponderableness, noun
imponderably, adverb
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
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Word Origin and History for imponderable

1794, "weightless," from assimilated form of in- (1) "not, opposite of" + ponderable (see ponder). Figurative use, "unthinkable," from 1814. Related: Imponderably. As a noun, by 1842.

Online Etymology Dictionary, © 2010 Douglas Harper
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