The qualification sporadic, indicating that occurrences of some phenomenon are rare and not systematic, can be used for:
Mathematics
- Sporadic group, any of a small number of finite groups that do not fit into any infinite family of groups
Medicine
- Sporadic disease, any of several diseases
Science
- Sporadic E propagation, an unusual form of radio propagation occasionally allowing long-distance communication
- Sporadic meteor, not part of a meteor swarm
- Sporadic permafrost, discontinuous permafrost that covers only a fraction of an area
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