This is the 3780th most frequent Spanish word.
reflejo
Reflection or reflex.
In this sentence, 'reflejo' refers to the image or light that bounces off by reflecting.
El reflejo del sol en el agua crea un efecto hermoso.
The reflection of the sun on the water creates a beautiful effect.
Here, 'reflejo' is used metaphorically to indicate representation or evidence of something.
Su reacción rápida es un buen reflejo de su entrenamiento.
His quick reaction is a good reflection of his training.
In this usage, 'reflejo' refers to a physiological reaction in the body to a stimulus.