formal
/ˈfȯr-məl/
adjective
belonging to or constituting the form or essence of a thing
relating to or involving the outward form, structure, relationships, or arrangement of elements rather than content
following or according with established form, custom, or rule
formal cause
formal logic
ceremonial ceremonious formal conventional mean marked by attention to or adhering strictly to prescribed forms. ceremonial and ceremonious both imply strict attention to what is prescribed by custom or by ritual, but ceremonial applies to things that are associated with ceremonies , ceremonious to persons given to ceremony or to acts attended by ceremony.
noun
something (such as a dance or a dress) formal in character
adjective
molar