occasional (
http://definr.com/occasional)
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:
episodic]
3: employed in a specified capacity from time to time; "casual
employment"; "a casual correspondence with a former
teacher"; "an occasional worker" [syn:
casual]