cātumāsiniyā

fem instr sg of cātumāsinī (noun); fem dat sg of cātumāsinī (noun); fem abl sg of cātumāsinī (noun); fem gen sg of cātumāsinī (noun); …

cātumāsinī (fem): full moon of the fourth month (of a season); full moon marking the transition of one season to another
cātumāsī (adj): on the full moon of the fourth month (of a season); on the full moon marking the transition of one season to another; lit. belonging to the fourth month

Etymology. catu > cātu + māsa + *inī; Sanskrit cāturmāsī

Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.

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