Excerpt from the Lexham Bible Dictionary, the most advanced Bible dictionary.
A member of the Corinthian church who was with Paul when he wrote his first letter to the church in Corinth (1 Cor 16:17). Achaicus is mentioned with Stephanas and Fortunatus, and therefore may have been a leader in the church (see 1 Cor 16:15).
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The Lexham Bible Dictionary
The Anchor Yale Bible Dictionary
ACHAICUS (PERSON) [Gk Achaikos (Ἀχαικος)]. A Corinthian Christian who, along with Stephanas and Fortunatus, traveled from Corinth to be with Paul in Ephesus (1 Cor 16:17). The name “Achaicus,” which means “one who is from Achaia,” suggests that he was a slave or former slave from that region since slaves
Baker Encyclopedia of the Bible
The International Standard Bible Encyclopedia, Revised
Tyndale Bible Dictionary
The HarperCollins Bible Dictionary (Revised and Updated)
Achaicus (uh-kay´uh-kuhs), a Christian from Corinth who, with Stephanas and Fortunatus, was with Paul in Ephesus when he wrote 1 Corinthians (16:17). The three apparently brought information to Paul concerning the condition of the church in Corinth and perhaps were the bearers of the letter mentioned
The Wycliffe Bible Encyclopedia
The New Bible Dictionary, Third Edition
ACHAICUS. A Corinthian Christian (1 Cor. 16:17): on his position see *Fortunatus. The name suggests a slave or ex-slave of Achaia, or possibly in the service of the Mummii: it was the title of L. Mummius, creator of Roman Achaia (and destroyer of *Corinth), and was retained in his family in Paul’s lifetime
Eerdmans Dictionary of the Bible
Eerdmans Bible Dictionary
Catholic Bible Dictionary