Final answer:
The word that defines 'inflict harm in return for an injury' is 'a) Avenged'. 'Avenge' is about seeking retribution, while the other options have different meanings unrelated to retaliation.
Step-by-step explanation:
The vocabulary word that matches the definition "inflict harm in return for an injury" is a) Avenged. To avenge is to seek retribution or retaliation against someone who has wronged you or someone else.
The other options do not match the provided definition; b) Impunity means without fear of punishment or consequences, c) Immolation generally refers to a sacrifice, often by fire, and d) Accosted means to approach and address someone often in an aggressive way.