The definition of ago is before now or in the past.
(adjective)An example of ago used as an adjective is in the phrase "days ago."
Ago is defined as in the past or before.
(adverb)An example of ago used as an adverb is in the phrase "long ago."
See ago in Webster's New World College Dictionary
adjective
Origin: ME agon, pp. of agon, to depart < OE agan, to pass away < a-, away + gan: see go
adverb
See ago in American Heritage Dictionary 4
adverb & adj.
Origin:
Origin: Middle English
Origin: , past participle of agon, to go away
Origin: , from Old English āgān
Origin: : ā-, intensive pref.
Origin: + gān, to go; see ghē- in Indo-European roots
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