on occasion

on occasion

1. Occasionally, from time to time, now and then.

   Only on rare occasion.

   • 1949, F. A. Hayek, “The Intellectuals and Socialism”, in University of Chicago Law Review, volume 16, number 3, Chicago: University of Chicago, →DOI, page 425:

     It is not in itself surprising that a genuine advance of knowledge should in this manner become on occasion a source of new error.