Synonyms for Ago:

adj.

all (adjective)
agone.
past (adjective)
bygone, primeval, former, historical, primordial, previous, ancient, yesterday's, anteceding, old, yore, past, old-time.

adv.

in the past (adverb)
before, Since.

n.

at one time, previously, one day, once, already. ago (noun)
agone, past.
gone (noun)
before, Since.

Other synonyms:

previously. once, Since. already. in time
before.
Other relevant words:
agone, before, previously, once, Since, already.

Usage examples for ago

  1. Really that is not so long ago as it seems. – A Red Wallflower by Susan Warner
  2. But how long ago – Peter and Wendy by James Matthew Barrie