1. keystone - Noun
2. keystone - Verb
3. Keystone - Proper noun
The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of Arch.
Source: Webster's dictionaryfaith is his anchor Source: Internet
the keystone of campaign reform was the ban on soft money Source: Internet
he is the linchpin of this firm Source: Internet
Cartoon about the absence of the U.S. from the League of Nations, depicted as the missing keystone of the arch. Source: Internet
Chan (1963) However, the concepts of those keystone texts cannot be equated with Taoism as a whole. Source: Internet
A legal battle over the deadline for mail in ballots has made things murkier in the Keystone State, and the mail in ballots more favoured by Biden supporters could mean that early results from the state don’t give us the full picture. Source: Internet