The classical fast day, kept for Vishnu: good for vrata, prayer, charity and study. The muhurta texts treat it as unsuitable for marriage and for the beginning of construction, since it is the tithi of fasting rather than of action. Nanda class.
Meaning
Ekadashi is the eleventh tithi, the day of the Ekadashi fast in both fortnights, and it belongs to Vishnu. It is the tithi most observed in ordinary Hindu practice, and in the panchanga it is read through the story of its twenty-four named forms, one for each Ekadashi of the year.