The act or process of enlivening; the quality or state of being enlivened.
From 'enliven' plus the noun-forming suffix '-ment,' which turns verbs into abstract nouns representing the result or condition of an action. This follows the same pattern as 'employment,' 'development,' and 'improvement.'
The word 'enlivenment' is mostly found in older literature and formal writing, where it might describe something like 'the enlivenment of the soul through music'—it's the sophisticated way to talk about that feeling of coming alive, suggesting something more profound than just 'livening up.'
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