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emotion
A broad term describing the internal psychological state that reacts to external stimuli. It is an umbrella concept covering both positive (joy, love) and negative (anger, grief) states. Unlike 'mood', which is often a long-term background state, an emotion is typically acute, intense, and triggered by a specific event or thought. When used to describe a person's demeanor (e.g., "speaking with emotion"), it shifts from the abstract category of feeling to the visible manifestation of passion or vulnerability. In this context, it often implies a loss of clinical detachment.
Countable when referring to a specific type of feeling, such as joy or anger ('Love is a complex emotion'). Uncountable when describing the general quality of being passionate or tearful ('His voice was thick with emotion').