"occasional" in the adjective sense
1. occasional
occurring from time to time
"took an occasional glass of wine"
2. episodic, occasional
occurring or appearing at usually irregular intervals
"episodic in his affections"
"occasional headaches"
3. casual, occasional
occurring on a temporary or irregular basis
"casual employment"
"a casual correspondence with a former teacher"
"an occasional worker"
4. periodic, occasional
recurring or reappearing from time to time
"periodic feelings of anxiety"
Source: WordNet® (An amazing lexical database of English)
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