Of which I'm almost certain.

That a long time ago someone said they were almost certain about something, quite creatively coining a term of two words paired at odds that meant they felt a sense of certainty, and though they wouldn't bet their life on it, they chose to exploit the sense and how close to sure it felt. It was no doubt in my mind — or nearly none, I can almost assure you — a brilliantly nuanced expression of precision destined to die an indistinct death. This pair so paired would through common use become tired enough eventually someone like me would wonder when it was someone decided certainty prevails in degrees. A unique circumstance? Barely.