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Iscool:Your Church defines itself as the community of believers, the assembly (ekklesia) of all who believe in Jesus Christ; or the fellowship (koinonia) of all who are bound together by their common love for the Savior. As the kingdom (basileia), it is the fulfillment of the ancient prophecies about the reign of the Messiah. And as the Mystical Body it is the communion of all those made holy by the grace of Christ. He is their invisible head and they are his visible members. These include the faithful on earth, those in purgatory who are not yet fully purified, and the saints in heaven.

The definition iscool gave isn't so different than what your CCC gives.

And if it is, then is the person giving it wrong?

And is he speaking under the authority of or invested with the authority of the Catholic church?

http://www.vatican.va/archive/ENG0015/__P27.HTM

751 The word "Church" (Latin ecclesia, from the Greek ek-ka-lein, to "call out of") means a convocation or an assembly. It designates the assemblies of the people, usually for a religious purpose.139 Ekklesia is used frequently in the Greek Old Testament for the assembly of the Chosen People before God, above all for their assembly on Mount Sinai where Israel received the Law and was established by God as his holy people.140 By calling itself "Church," the first community of Christian believers recognized itself as heir to that assembly. In the Church, God is "calling together" his people from all the ends of the earth. the equivalent Greek term Kyriake, from which the English word Church and the German Kirche are derived, means "what belongs to the Lord."

752 In Christian usage, the word "church" designates the liturgical assembly,141 but also the local community142 or the whole universal community of believers.143 These three meanings are inseparable. "The Church" is the People that God gathers in the whole world. She exists in local communities and is made real as a liturgical, above all a Eucharistic, assembly. She draws her life from the word and the Body of Christ and so herself becomes Christ's Body.