Average Time of Arrival.
When you're late
regularly to work, school etc. but more
or less arrive at the same time every day.
Boss: Hey it's 9.45, you're 45 minutes late! You've been late every single day since you started
here, what's your excuse??
Employee: I'm not late. I show
up every day between 9.30 and 10 so I'm right on the nose of my A.T.A :)