Such a day that commemorates a wedding.
A day that is an exact number of years (to the day) since a given significant event occurred. Often preceded by an ordinal number indicating the number of years.
A day subsequent in time to a given event by some significant period other than a year (especially as prefixed by the amount of time in question).
A particularly significant day; a day of personal or sectarian celebration.
A day marked in red on calendars; a church feast day.