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English word Purnima comes from Sanskrit पूर्ण, and later Sanskrit पूर्णिमा (Day of full moon. Night of full moon.)
पूर्ण (Sanskrit)
Ended, completed. Filled, filled with, full of. Fulfilled, accomplished. Full-sounding, sonorous. Past, elapsed. Satisfied, contented. Selfish, self-indulgent. Strong, powerful. Whole, full, entire, complete.
पूर्णिमा (Sanskrit)
Day of full moon. Night of full moon.
Purnima (English)
(Hinduism) The full moon. The day (tithi) in each month in which the full moon occurs, and marks the division in each month between the two lunar fortnight in Hindu calendar.