Ago
The adverb ago refers to a period of time that is completed and goes from a point in the past up to now. Ago follows expressions of time: …

ago | American Dictionary

ago
adverb[ only after n, not gradable ]
us/əˈɡoʊ/
back in the past; back in time from the present:
That was a few years ago.
Your mother called about an hour ago.
Some time ago I read a book about that.
Are you still seeing Vivian? No, we stopped seeing each other a long time ago.

Examples of ago

ago
There have been reports of some localised fumarole activity during the past 100 years, and a new lava flow broke out only 20 years ago.
Whilst the events described in this book took place several decades ago, they remain uncannily contemporary.
It is interesting to note that the concept of natural selection as the sole force in maintaining polymorphisms went virtually unquestioned 15 years ago.
This goal seemed virtually unattainable not long ago.
Since their introduction over 10 years ago, oral contraceptives have gained wide and ever-increasing acceptance as a satisfactory and relatively trouble-free means of fertility control.
The rotation of political power to an opposition party more than three years ago has not ended the streaks of political corruption.
A century ago, just reaching it was the ardent dream of many explorers.
The suggestion that such 'traditional' cultures and identities are fixed and static has lost currency long ago.
The showman explained that twenty years ago he collected five pounds a week on average, earning seven or eight shillings from each street performance.
Increased subaerial volcanism and the rise of atmospheric oxygen 2.5 billion years ago.
We are certainly attacking more and more complex conditions, including those considered hopeless not very long ago.
The first humans arose about two million years ago.
Imagine a political scientist who fell asleep twenty-five years ago.
Some years ago it was difficult to properly evaluate an artistic movement that quite autonomously was in the process of development.
In evolutionary terms, a century is of no significance - indeed we are genetically almost identical to our ancestors of 10 centuries ago.
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