masc instr sg of ānanda (noun)
Etymology. ā + √nand, 'to rejoice toward': ā reverses motion to mean 'toward the speaker' or 'up to', and √nand (Sanskrit nand-, 'to be glad') is the root of enjoyment and delight. Cognate with Sanskrit nanda- and the Proto-Indo-European root *gʰend- 'to seize, grasp' (underlying Latin hendere in comprehendere). The prefix ā pulls the sense of rejoicing inward, making it a state of gladness arrived at or embraced.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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