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punctilio (n.)

1590s, "small point," also "minute detail of conduct, small or petty formality," thus "particularity or exactness in the observance of rules or forms prescribed by law or custom," from Italian puntiglio or Spanish puntillo, diminutive of punto "point" (see point (n.)).

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Definitions of punctilio from WordNet

punctilio (n.)
a fine point of etiquette or petty formality;
punctilio (n.)
strict observance of formalities;
From wordnet.princeton.edu