What is the meaning of Vitality?

The capacity to live and develop.

Energy or vigour.

That which distinguishes living from nonliving things; life, animateness.

Jespersen, Otto (1909) A Modern English Grammar on Historical Principles (Sammlung germanischer Elementar- und Handbücher; 9), volumes I: Sounds and Spellings, London: George Allen & Unwin, published 1961, § 4.86, page 145.

Source: wiktionary.org