WordWeb Online

1. Unusualness as a consequence of not being well known
   - unfamiliarity
    
2. (physics) one of the six flavours of quark, the third lightest of all quarks
    
3. The quality of being alien or not native
   "the strangeness of a foreigner";
   - foreignness, curiousness

See also: foreign, strange

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

Encyclopedia: Strangeness