centerpiece
n. countable B2 Upper Intermediate US //ˈsɛntɝˌpis// cen·ter·piece
n. the most important part of something, or a decoration placed in the middle of a table.
n. the central or most important feature of an item, event, or arrangement; also refers to an ornamental object placed in the middle of a dining table.
The new stadium is the centerpiece of the city's plan.
A large bowl of fresh fruit served as the centerpiece for the wedding reception table.
The proposed tax reform became the centerpiece of the candidate's campaign, drawing both intense support from local businesses and sharp criticism from opposition leaders.
Usage
Often used metaphorically to describe the primary focus of a policy, project, or argument.