Longman Dictionary of Contemporary English homepage

foundation stone

 noun
     
Related topics: Building
foundation stone [countable]
1TB a large stone that is placed at the base of a new building, usually by an important person as part of a ceremony
2 the facts, ideas, principles etc that form the base from which something else develops:
Greek and Latin were once viewed as the foundation stones of a good education.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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