The book presents the most commonly used and academically significant idioms, homonyms, and abbreviations in modern Armenian, providing essential explanations and interpretations. It is an expanded and updated version of the glossaries that first appeared as appendices in the Lexicology volume of the School Series (2007 edition). The dictionary serves both as a study guide and as a reference for exam question preparation. It is intended for high school students, university applicants, educators, and anyone interested in the distinctive layers of the Armenian vocabulary. The dictionary contains nearly 3,000 entries, including 1,200 idioms, 1,100 homonyms, and 700 abbreviations.