The Avestan word bitiia-
Word bitiia-
Meaning second

Other words that might be of interest
aēuua ‘one’, ašta ‘eight, 8’, xšuuaš ‘six, 6’, θritiia- ‘third’, paoiriia- ‘first’, paṇca ‘five, 5’, hapta ‘seven, 7’, caθβarasca ‘four’