What does the term antichrist mean in the Bible?

The term 'antichrist' as used in 1 John refers to anyone who denies the core truths about Christ, including His deity and the necessity of His redemptive work. John specifically alerts believers to the presence of many antichrists in his time, indicating a spirit of opposition to Christ that persists today. This is evident when people claim to follow Christ yet distort or deny essential doctrines of the faith. Understanding this helps Christians discern true teachings from false ones, and emphasizes the importance of remaining grounded in the truth of the gospel.