Keystone(noun)

The central and most important part of something on which all else depends.
Hindi meaning:मुख्य आधार / केंद्रीय तत्व
Synonyms: Foundation, Cornerstone, Core, Mainstay
Antonyms: Triviality, Detail, Accessory, Nonessential
Example: Trust is the keystone of a strong relationship.
Trick to remember: Keystone = key + stone, so think of the one stone that holds the whole arch together.









