1. on occasion - Adverb
2. on occasion - Phrase
sporadically and infrequently
Source: WordNetExcess on occasion is exhilarating. It prevents moderation from acquiring the deadening effect of a habit. W. Somerset Maugham
Great men of action never mind on occasion being ridiculous; in a sense it is part of their job. Oswald Mosley
The most dangerous madmen are those created by religion, and people whose aim is to disrupt society always know how to make good use of them on occasion. Denis Diderot
The Art of Peace is not easy. It is a fight to the finish, the slaying of evil desires and all falsehood within. On occasion the Voice of Peace resounds like thunder, jolting human beings out of their stupor. Morihei Ueshiba
In order to understand the world, one has to turn away from it on occasion. Albert Camus
He is not a wise man who cannot play the fool on occasion. Italian Proverb