1. Unusualness as a consequence of not being well known
   "The strangeness of the terrain made navigation challenging";
   - unfamiliarity
    
2. The quality of being alien or not native
   "the strangeness of a foreigner";
   - foreignness, curiousness
    
3. (physics) one of the six flavours of quark, the third lightest of all quarks
   "The experiment aimed to measure the strangeness of the newly discovered particle"

See also: foreign, strange

Type of: flavor [US], flavour [Brit, Cdn], quality, unusualness

Antonym: familiarity, nativeness

Encyclopedia: Strangeness