underpinning
US /ˈʌn.dɚˌpɪn.ɪŋ/
UK /ˈʌn.dɚˌpɪn.ɪŋ/
1.
a set of ideas, figures, or structures that provides a base or foundation for something
:
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The theory's main underpinning is based on extensive research.
•
Strong ethical principles form the underpinning of their business.