The process of becoming active or coming into operation; the actualization or realization of energy or potential.
From Greek 'energeia' (activity, actuality) plus '-sis' (a suffix forming nouns of action or process). It emphasizes the process rather than the state.
While 'energeia' is the state of being active, 'energesis' is the *process* of becoming active—a subtle distinction that English rarely bothers to make, which is why this Greek term rarely appears in modern usage.
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