There are several synonyms for the term "I Thessalonians", which refers to one of the books of the New Testament in the Bible. Some of the alternative names for this book include "1 Thessalonians", "First Thessalonians", and "First Epistle to the Thessalonians". The book is a letter written by the apostle Paul to the church in Thessalonica and is noted for its teachings on the second coming of Jesus Christ. It is also significant for its emphasis on living a holy and blameless life in anticipation of Christ's return. Overall, I Thessalonians provides important Christian teachings and inspiration for believers everywhere.