This is the 12016th most frequent French word.
totales
"Totales" means "total" or "complete" (plural form).
The word 'totales' is used here as an adjective describing the complete or absolute state of the darkness during the eclipse.
Les ténèbres étaient totales durant l'éclipse.
The darkness was total during the eclipse.
In this sentence, 'totales' describes the all-encompassing nature of his mathematical knowledge.
Ses connaissances en mathématiques sont totales.
His knowledge in mathematics is comprehensive.
Here, 'totales' refers to the complete level of destruction caused by the storm.