Longman Dictionary of Contemporary English - ago

~ [s]ago.jpg[/s] S1 W1 adj used to show how far back in the past something happened 5 minutes/an hour/20 years ~  (Michael left the office about half an hour ago.) long ~/a long time ~  (I met Aunt Hetty once, a very long time ago.) a minute/moment ~  (I had my keys a minute ago, and now I can't find them.) a little/short while ~  (Tom got a letter from him just a little while ago.) some time ~ (=a fairly long time ~)  (They moved to a new house some time ago, a couple of years I think.)  (- see also for1 (8), since3)