"Million". Online Etymological Dictionary. Retrieved 19 August 2022.
jewishencyclopedia.com
Levias, Caspar (1905). "Numbers and numerals". In Singer, Isidore; et al. (eds.). The Jewish Encyclopedia. Vol. 9. New York: Funk & Wagnalls. p. 349. Retrieved 2017-04-27. "Forty: Stands in the Bible for a generation (e.g., the forty years of wandering in the desert), hence for any period of time the exact duration of which is unknown (comp. Gen. vii. 4, 12, 17; viii. 6; Ex. xxiv. 18, xxxiv. 28; Deut. ix. 9, 11, 18; x. 10; I Sam. xvii. 16; I Kings xix. 8; Jonah iii. 4). In later literature forty is commonly used as a round number (comp. Giṭ. 39b, 40a; Soṭah 34a; Yer. Ta'an. iv. 8; et al.)."