Question

definition
mental and emotional strength in facing difficulty

Explanation:

The given definition describes a concept related to psychological resilience or fortitude in dealing with challenges. In the context of Social Science, specifically Psychology (a subfield of Social Science), this definition aligns with terms like "resilience" or "fortitude" which are studied in the realm of understanding human mental and emotional responses to difficulties. Psychology focuses on mental and emotional processes, so this definition falls under the purview of Psychology within Social Science.

Answer:

The concept defined (mental and emotional strength in facing difficulty) is most related to the subfield of Psychology (within Social Science).