Wordnet 3.0
VERB (2)
1. 
 center upon; 
- Example: "Her entire attention centered on her children"- Example: "Our day revolved around our work"[syn: focus on, center on, revolve around, revolve about, concentrate on, center]
2.  have as a center; 
- Example: "The region centers on Charleston"
WordNet (r) 3.0 (2006):
center on
    v 1: center upon; "Her entire attention centered on her
         children"; "Our day revolved around our work" [syn: focus
         on, center on, revolve around, revolve about,
         concentrate on, center]
    2: have as a center; "The region centers on Charleston"