* Embrace - This suggests actively accepting and engaging with all life has to offer.
* Thrive - This emphasizes flourishing and experiencing success and happiness.
* Flourish - Similar to thrive, this word denotes growth and positive development.
* Savor - This highlights the importance of appreciating and enjoying every moment.
Ultimately, the best "one-word" definition depends on what aspect of "living life to the fullest" you want to emphasize.