What is the definition of "sporadic"?

The definition of "sporadic" accurately corresponds to the idea of being "occurring at irregular intervals, having no set plan or order." This term implies that events or occurrences do not follow a predictable pattern and happen intermittently, rather than consistently or systematically.

In contrast, the other choices suggest a level of regularity and predictability that is fundamentally opposed to the meaning of "sporadic." For instance, the first option indicates consistency, which is the opposite of irregularity. The third choice describes frequency and predictability, again suggesting a constant occurrence rather than sporadic. The last option implies simultaneous occurrences, which also negates the irregular nature central to the definition of "sporadic." The option that captures the essence of unpredictable and infrequent occurrences is indeed the correct definition.