3rd person singular feminine present indicative of yāti (surface form yāyaṁ with sandhi: yā + ayaṁ)
Analysis. yāyaṁ is the 3rd person singular feminine present indicative (yā-ti) followed by the feminine nominative singular pronoun ayaṁ 'she', contracted through sandhi: yā + ayaṁ > yāyaṁ. The analysis shows motion: 'she goes' or as a single word 'goes/is going (she)'.
Etymology. √yā, cognate with Sanskrit yāti and Latin īre (to go), all from the Indo-European root *ei̯- (to move, go). The sense is simply motion or travel from place to place.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version