1 definition by flaw28

it means, "all at once-ness" a.k.a everything occuring at the same time.
There was a sense of allatonceness in the hospital; a man was dying while a baby was being born, a nurse fell to the floor as a doctor vommited, and there I was, perceiving it all.
by flaw28 November 20, 2010
Get the allatonceness mug.