transcription, транскрипция: [ noun ]
or eon ˈē-ən, ˈē-ˌän
Etymology: Latin, from Greek aiōn — more at aye
Date: 1647
1. : an immeasurably or indefinitely long period of time : age
2.
a. usually eon : a very large division of geologic time usually longer than an era
b. : a unit of geologic time equal to one billion years