This is the 12189th most frequent Russian word.
инерции
"Inерции" means "inertia" in English.
In this sentence, 'инерции' refers to a property of physical objects to resist changes in their state of motion.
Его движение продолжалось за счет инерции.
His movement continued due to inertia.
Here, 'инерции' is used metaphorically to describe someone's habitual actions akin to being carried forward automatically.
Он действовал по привычке, словно по инерции.
He acted out of habit, as if by inertia.
In this usage, 'инерции' metaphorically describes the momentum sustained by past achievements propelling further progress.