Definition of "occasional"

The highway to the East Coast which ran through the borough of Ebbfield had always been a main road and even now, despite the vast garages, the pylons and the gaily painted factory glasshouses which had sprung up beside it, there still remained an occasional trace of past cultures.

1963, Margery Allingham, chapter 7, in The China Governess‎

But the truth is that plenty of artists from other countries make work that's bold, naughty or nasty, without getting more than a very occasional headline.

2003 April 17, Blake Gopnik, “Art That Advertises Itself; Saatchi's Ornate New Gallery Pits Young British Artists Against the Establishment”, in Washington Post