1. (

• cerium ,
• Ce ,
• atomic_number_ ,

) a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group ;

1. (

• CE ,
• C.E. ,
• Common_Era

) of the period coinciding with the Christian era; preferred by some writers who are not Christians; "in 200 CE" ;