a·go 
(ə-gō)
(ə-gō)adv. & adj.
1. Gone by; past: two years ago.
2. In the past: It happened ages ago.
[Middle English, past participle of agon, to go away, from Old English āgān : ā-, intensive pref. + gān, to go; see ghē- in the Appendix of Indo-European roots.]