Source : Webster's Revised Unabridged Dictionary (1913)

Ago \A*go"\, a. & adv. [OE. ago, agon, p. p. of agon to go away,
   pass by, AS. [=a]g[=a]n to pass away; [=a]- (cf. Goth. us-,
   Ger. er-, orig. meaning out) + g[=a]n to go. See {Go}.]
   Past; gone by; since; as, ten years ago; gone long ago.

Source : WordNet®

ago
     adj : gone by; or in the past; "two years ago"; "`agone' is an
           archaic word for `ago'" [syn: {agone}]

ago
     adv : in the past; "long ago"; "sixty years ago my grandfather
           came to the U.S."