Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

noun. the fundamental groundwork of character, generally presumed to be biologically determined and existent early in life, inclusive of traits like emotional reactiveness, energy level, reaction tempo, and motivation to explore. In animal actions, is explained as an individual

TEMPERAMENT: "The child's temperament is definitely out of the ordinary for the average kid, but not so much for those who have lived their lives in foster care."

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