occasional

英[ə'keɪʒ(ə)n(ə)l] 美[ə'keʒənl]

1. occurring from time to time;

"took an occasional glass of wine"

2. occurring or appearing at usually irregular intervals;

"episodic in his affections"

"occasional headaches"

3. employed in a specified capacity from time to time;

"casual employment"

"a casual correspondence with a former teacher"

"an occasional worker"