"three" denunciations on roman catholic marriage cert

[heywood]

If you look back at earlier posts we write about denunciations and impediments.

My belief is that denunciations refers to Banns. Banns were read on three consecutive Sundays (tres) or there was a recorded dispensation from the regular process  of Banns.
It does not refer to the number of objections or similar.

‘Impediments’ refers to conditions which would affect the validity of the marriage e.g.  consanguinity and affinity.

[Maiden Stone]

Reply #18 by heywood explains "denunciations" and impediments.
There are/were several reasons why dispensations or permissions are/were required for a wedding in a Catholic church e.g. if one party wasn't Catholic; if a couple wanted/needed to marry during Lent. Parish priests could grant dispensations for some routine, straightforward matters. Others had to be referred to a superior cleric in the diocese.
RootsChat has many threads about dispensations; some contain links to further information.
Shay makes an interesting point about contrasts with rural parishes. A large city parish would have replaced registers frequently while a rural parish may have been using the same ones for decades. Format of registers may have changed during the period.

[heywood]

Thanks Maiden Stone. You are always so informative. 
My family parish in County Mayo has scant marriage records and they are all rewritten on Catholic NLI so no additional notes.
My husband’s family parish, on the hand, shows a column marked ‘kindred’ which is more explicit.
Example here:
https://registers.nli.ie/registers/vtls000634630#page/23/mode/1up

[Maiden Stone]

it makes for confusion compared with rural registers where the degrees of relatedness or dispensation, sometimes from the archbishop where an appeal has been made, were scribbled alongside the entry for the marriage.

Examples from parishes where members of my families married in 19th century.

Swords, County Dublin, Archdiocese of Dublin had proper marriage registers with printed column headings, double page entries for each wedding. Headings included names of fathers & mothers + their residences. 3 separate columns headed Denunciationes (a), Impedimenta (b) and Observanda (final column). Looked at 2 random years 1857 & 1879. Several appear to have a dispensation of banns.
 https://registers.nli.ie/registers/vtls000633686#page/3/mode/1up   https://registers.nli.ie/registers/vtls000633686#page/43/mode/1up

Marriage registers in my grandparents' 2 Mayo parishes contained sparse information. Marriage entries took up a single page width.
 Information in one for 1879 was date, names of groom, bride and witnesses, initials of priest and money received.
The other parish (mainly rural) was using a notebook (perhaps a cash/accounts book) for a marriage register in 1840s. Handwritten headings - Contracting Parties, Witnesses, Kindred. The only information for each wedding was date, names of groom, bride & witnesses, + degree of consanguinity or affinity, if any. The parish had progressed to a register with printed headings later in the century. Headings were Date, Number, Contracting Parties, Witnesses, Impediments. There was no residence column so residence (generally townland) was written in Impediments column for some marriages.

Writers of those registers would not have imagined lay people trying to decipher and make sense of them more than a century later.