Maria,
Maybe this list may help you too in the future with terms used..
http://www.roangelo.net/vocabula.html
From this link, here is the definition..
processetti matrimoniali: documents required by the
civil authority for marriage (also called
allegati): birth certificates (atti di nascita) of
the spouses (and for when weddings took place only
at church: proof of baptism); death certificates
of deceased parents (atti di morte) (and when a
father was deceased, also the death certificate of
his father), since people, regardless of their
age, could not marry without parental consent;
summary of the marriage banns (pubblicazioni) with
testimony that they had been posted for the period
required by law; and for when weddings took place
only at church: a notation (indicazione) by the
parish priest that the wedding had taken place.
The decision of a Consiglio di famiglia also
belongs among the processetti. See atto di
matrimonio and atto della solenne promessa, and
this description of the role of processetti in
family history research.