Punctilio

n.

1.

A nice point of exactness in conduct, ceremony, or proceeding; particularity or exactness in forms; as, the punctilios of a public ceremony. They will not part with the least punctilio in their opinions and practices. - Fuller.

Noun	1.	punctilio - a fine point of etiquette or petty formality
	2.	punctilio - strict observance of formalities

etiquette