base, foundation stone, memorial stone, starting point; see foundation 2.
"cornerstone." YourDictionary, n.d. Web. 12 October 2018. <http://thesaurus.yourdictionary.com/cornerstone>.
cornerstone. (n.d.). Retrieved October 12th, 2018, from http://thesaurus.yourdictionary.com/cornerstone
A fundamental principle or underlying concept:
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