mécanisme

/me.ka.nism/
1.
nounmasculineSing

mechanism (a mechanical device or the parts that make something work)

workings

Je ne comprends pas comment fonctionne le mécanisme de cette montre.

I don't understand how the mechanism of this watch works.

2.
nounmasculineSing

process or procedure by which something operates

psychological or social mechanism (e.g., defence mechanism)

C'est un mécanisme de défense psychologique assez courant.

It's a fairly common psychological defence mechanism.