–noun, plural -til·i·os for 1.
1. a fine point, particular, or detail, as of conduct, ceremony, or procedure.
2. strictness or exactness in the observance of formalities or amenities.
1590–1600; alter. of It puntiglio < Sp puntillo, dim. of punto < L pūnctum point
Cugel watched them a moment or two; their punctilio and elegant gestures suggested the manners of an age far past.
Source: Tales of the Dying Earth by Jack Vance.