Etimology
From Middle English ago, agon (“passed”), past participle of agon (“to depart, escape, pass”), from Old English āgān (“to go away, pass away, go forth, come to pass”), from Proto-Germanic *uz- (“out”), *gāną (“to go”), equivalent to a- + gone. Cognate with German ergehen (“to come to pass, fare, go forth”). Compare also Old Saxon āgangan (“to go or pass by”), Gothic 𐌿𐍃𐌲𐌰𐌲𐌲𐌰𐌽 (usgaggan, “to go forth”).
adjective
ago (comparative more ago, superlative most ago)
(archaic or dialectal) Gone; gone by; gone away; passed; passed away.
(archaic or dialectal) Nearly gone; dead (used in Devonshire at the turn of the 19th century)
Examples
in days ago/in days agone
Woe the day- she is agone!
adverb
ago (comparative more ago, superlative most ago)
before
Examples
When they first met in 2000, my dad told my mom how he had gotten the money. The story begins 20 years ago.
preposition
ago
(used postpositively) Before now.
Examples
I got married ten years ago.
Two years ago a pair of scientists sparked fears of a devastating virus.