center

[1]	focus on , center on , revolve around , revolve about , concentrate on
[2]	concentrate , focus , centre , pore , rivet
[3]	centre

[1]	centre , middle , heart , eye
[2]	center field , centerfield
[3]	centre
[4]	centre , midpoint
[5]	kernel , substance , core , centre , essence , gist , heart , heart and soul , inwardness , marrow , meat , nub , pith , sum , nitty-gritty
[6]	centre , center of attention , centre of attention
[7]	centre , nerve center , nerve centre
[8]	snapper
[9]	centre
[10]	centre
[11]	plaza , mall , shopping mall , shopping center , shopping centre

adj.

[1]	halfway , middle , midway