According to Freud, a lasting conflict that develops as the result of excessive frustration or gratification at a particular stage of development is called a(n) .

According to Freud, a lasting conflict that develops as the result of excessive frustration or gratification at a particular stage of development is called a Fixation.

Explanation:

Fixation is the word which is used in many sectors to represent a single meaning which is "to joint". In health the sector if a bone got fractured than the joints of bone are combined by plastering to fix the bones together. In social life if two parties or more than two are having conflict regarding any common matter, after a day or days long conversations or conflicts some common decision is taken to fix the issue occurring between them.