adhikatithi
Goldstücker Sanskrit-English Dictionary
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p. 54, col. 1.
adhikatithi Karmadh. m. f. (
-thiḥ-thiḥ) An intercalary lunar
day. When no tithi (q. v.) begins or ends in a solar day,
the numeral of the preceding is repeated in the calendar,
the first tithi being accounted the intercalated and the second
the proper one. Compare kṣayatithi. E. adhika and tithi.
Monier-Williams Sanskrit-English Dictionary (2nd ed.)
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p. 20, col. 2.
adhika—tithi mf. an intercalary lunar day.