LEARNit Dictionary
foundation stone
noun
/faʊnˈdeɪʃn stəʊn/
UK
/faʊnˈdeɪʃn stəʊn/
US
1
a large block of stone that is put at the base of an important new public building in a special ceremony
سنگبنا, سنگاساس, سنگپایه
2
a basic or essential element of something
اساس, پایه, بنیان, سنگ بنا, زیربنا
Family life is one of the foundation stones of society.