underpinning
US /ˈʌn.dɚˌpɪn.ɪŋ/
UK /ˈʌn.dɚˌpɪn.ɪŋ/

1.
fondement, base, soutien
a set of ideas, figures, or structures that provides a base or foundation for something
:
•
The theory's main underpinning is based on extensive research.
Le principal fondement de la théorie est basé sur des recherches approfondies.
•
Strong ethical principles form the underpinning of their business.
Des principes éthiques solides constituent le fondement de leur entreprise.