Final answer:
Clusters of traits that define how people normally react in situations are called dispositions.
Step-by-step explanation:
Clusters of traits that define how people normally react in situations are called dispositions. These dispositions are the long-standing traits and patterns that propel individuals to consistently think, feel, and behave in specific ways. For example, someone with a disposition for extraversion may tend to be outgoing, talkative, and sociable in various situations.