Noun
a New Testament book containing the epistle from Saint Paul to the Ephesians which explains the divine plan for the world and the consummation of this in Christ
Source: WordNetThe form, as opposed to the earlier letters of Paul, suggests that the author knew Paul's Epistle to the Ephesians or even that the Pauline epistles had already been collected and were circulating when the text was written. Source: Internet
Later, Paul wrote the Epistle to the Ephesians while he was in prison in Rome (around 62 AD). Source: Internet