I don't see how that's the opposite. things can appear from time to time at regular intervals. do your intermittent wipers randomly move? no they move at regular intervals.

Let me explain: Periodic has a narrow definition and a broader more ambiguous definition. Which are opposites. For example one could say I get Time magazine on a periodic basis, which is semi-mo...

"irregular intervals" is a more narrow definition, but is not it's opposite. How can something be a narrower/broader definition AND be its opposite? the second definition just allows for non-equ...