the quality or condition of being strange.
Physics. a quantum number assigned the value −1 for one kind of quark, +1 for its antiquark, and 0 for all other quarks; the strangeness of a hadron is the sum of the values for the strangeness of its constituent quarks and antiquarks. Symbol: S
Compare strange quark.

1350–1400; Middle English; see strange, -ness Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
strangeness (ˈstreɪndʒnɪs)
1.  the state or quality of being strange
2.  physics a property of certain elementary particles, characterized by a quantum number (strangeness number) conserved in strong and electromagnetic but not in weak interactions. It is associated with the presence of strange quarks

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American Heritage
Science Dictionary
strangeness  [%PREMIUM_LINK%]     (strānj'nĭs)  Pronunciation Key 
The property of containing a strange quark or antiquark. Strangeness is expressed in terms of an integer quantum number, -1 for each strange quark and +1 for each strange antiquark. Hadrons that possess strangeness are called strange. The total strangeness of a quantum system is unchanged by decay processes involving the strong or electromagnetic forces; however, decay through the weak force can change the total strangeness of the system. See also baryon number, isospin.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
At their best, science fiction and theology can leave us awestruck before the
  unutterable strangeness and vastness of the cosmos.
There is no excellent beauty that hath not some strangeness in the proportion.
Romanticism is a short cut to the strangeness without the reality, and it leads
  its disciples only back upon themselves.
But they're fascinated by the unending strangeness of the mindless, evil
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