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

1.
fundamento, base, soporte
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.
El principal fundamento de la teoría se basa en una investigación exhaustiva.
•
Strong ethical principles form the underpinning of their business.
Fuertes principios éticos forman el fundamento de su negocio.