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 == grammar == 

 Definition  1. word meaning an utterly foolish or senseless person.  
 2. fool, half-wit; imbecile; dolt, dunce, numskull 
 (idiot[id-ee-uht])–noun opinionated 

 Origin:  
 1250–1300; ME < L idiōta < Gk iditēs private person, layman, person lacking skill or expertise, equiv. to idiō- (lengthened var. of idio- idio-, perh. by analogy with stratiōtēs professional soldier, deriv. of stratiá army) + -tēs agent n. suffix 
 idiot   
 c.1300, ""person so mentally deficient as to be incapable of ordinary reasoning,"" from O.Fr. idiote ""uneducated or ignorant person,"" from L. idiota ""ordinary person, layman,"" in L.L. ""uneducated or ignorant person,"" from Gk. idiotes ""layman, person lacking professional skill,"" lit. ""private person,"" used patronizingly for ""ignorant person,"" from idios ""one's own"" (see idiom). 
 Main Entry: id·i·ot 
 Pronunciation: 'i-dE-&t 
 Function;: noun 
 clasification;opinion 

  
 http://dictionary.reference.com/browse/idiot"