Topic summary
Plenary indulgence

Extracted from the Wikipedia article Indulgence.
Plenary indulgences
Among the particular grants, which, on closer inspection, will be seen to be included in one or more of the four general grants, especially the first, the Enchiridion Indulgentiarum draws special attention to four activities for which a plenary indulgence can be gained on any day, though only once a day: