oc·ca·sion·al /-ˈkeʒnəl, ˈkeʒənḷ/
1. Occuring at times, but not constant, regular, or systematic; made or happening as opportunity requires or admits; casual; incidental; as, occasional remarks, or efforts.
The . . . occasional writing of the present times. --Bagehot.
2. Produced by accident; as, the occasional origin of a thing. [Obs.]
Occasional cause Metaph., some circumstance preceding an effect which, without being the real cause, becomes the occasion of the action of the efficient cause; thus, the act of touching gunpowder with fire is the occasional, but not the efficient, cause of an explosion.
adj 1: occurring from time to time; "took an occasional glass of
wine" [syn: occasional(a)]
2: occurring or appearing at usually irregular intervals;
"episodic in his affections"; "occasional headaches" [syn:
3: employed in a specified capacity from time to time; "casual
employment"; "a casual correspondence with a former
teacher"; "an occasional worker" [syn: casual]