Webster's English Dictionary

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punctilio

punc.til.io \.p*n(k)-'til-e--.o-\ n [It & Sp; It puntiglio point of honor, 
   scruple, fr. Sp puntillo, fr]. dim. of punto point, fr. L punctum 1: a nice 
   detail of conduct in a ceremony or in observance of a code  2: careful 
   observance of forms (as in social conduct)