411 REFERENCE · Wiktionary
Bya
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Symbol
en symbol
en Q648908, which is ambiguous en bya<id:Q648908, which is ambiguous><gloss:billion years ago>.
en Q896543 en usually en bya<id:Q896543><gloss:billion years ago (short scale): 10⁹ years ago>.
en 1,000,000,000,000 years ago en uncommon dated en bya<id:1,000,000,000,000 years ago><gloss:billion years ago (long scale):10¹² years ago: a trillion years ago (short scale)>.