Final answer:
The term for exaggerated self-importance is megalomania. This psychological condition is marked by delusions of power and grandeur, distinguishing it from the unrelated terms magnanimity, macrocosm, and repletion.
Step-by-step explanation:
The word that names a form of exaggerated self-importance is c. megalomania. None of the other options given (macrocosm, magnanimity, repletion) pertain to self-importance. Megalomania is characterized by an obsession with power and an inflated sense of one's own importance or abilities, while magnanimity is generosity or the ability to forgive. Macrocosm refers to a complex structure, such as the universe, considered as a whole, and repletion means the condition of being fully supplied or filled.