From Wiktionary, the free dictionary
Ablative of авал (aval).
авалтан • (avalt̬an)
- since long ago, from time immemorial
- Чӑвашсем авалтан Атӑл ҫинче пурӑнаҫҫӗ. ― Čăvašsem avalt̬an At̬ăl ś̬inč̬e p̬urănaśśĕ. ― The Chuvash have lived on the Volga from time immemorial.