A verb meaning to proclaim, announce, or declare publicly — typically with a sense of authority and completeness. It is distinguished from simply talking or discussing by its formal, public, and authoritative character. Paul uses it repeatedly for the act of proclaiming the gospel.
Kataggello is one of the New Testament's primary proclamation words. It carries the sense of a herald's announcement — this is not private conversation but public declaration of news that changes everything. Paul says he was sent not to baptize but to preach — to kataggello the gospel (1 Corinthians 1:17). In Philippians 1, he rejoices that Christ is being proclaimed even by those with mixed motives: the message itself is powerful regardless of the messenger's purity. This has profound implications: the gospel is not a private philosophy to be discussed but a royal proclamation to be heralded to every person.