Auspicious for all good work: charity, religious rites, marriage, travel and the consecration of an image. Purna class.
Meaning
Dashami is the tenth tithi, and its adhidevata is Yama, the lord of death and of dharma. The tithi is a Purna one, read as favourable for completion, and the character of its deity is why the tithi is also used for works of dharma and for rites of obligation.