Meaning of AGO in English

AGO

[ago] adj or adv [ME agon, ago, fr. pp. of agon to pass away, fr. OE agan, fr. a- (perfective prefix) + gan to go--more at abide, go] (14c): earlier than the present time "10 years ~"

Merriam-Webster English vocab.      Английский словарь Merriam Webster.