By devavarṣa, they are probably referring to the Divine Year. The standard description in the Sūrya Siddhānta and the Purāṇas is that an year for human beings is one ahorātra (day+night) for the gods. Three hundred ahoratras of gods make one devavatsara, divyavatsara or devavarṣa.
The Smṛticandrikā at one place explains the need to put down the "varṣa" in a document as "devavarṣamityādi". I do not know what "devavarṣa" could be. It is not one of the 60 names of the Jupiter Cycle. Any help will be deeply appreciated. Thanks.
Patrick
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