Nominalism: Word of the Week

"A nominal Christian is one who says he/she is a Christian but hardly ever goes to church.  Or, someone who selects 'Christianity' as their religion for any official purpose (i.e. national census), but considers himself/herself to be a non-practicing Christian.  A nominal Christian may undertake religious activities, especially at Christmas/Easter, and proclaim fellowship with followers of Jesus (i.e. through being a member of a church), but in their heart they will possess apathy or even unbelief toward the sovereignty of Jesus Christ."

Source: www.wiki.answers.com/Q/What_is_a_nominal_Christian

To access more definitions check out The Lutheran Lexicon.