This dictionary aims to record the words of the new Greek language that have one or more synonyms and antonyms. The synonyms and antonyms of each word are grouped by meaning, while indicative usage examples are provided for better understanding of the meanings. It is an original and useful dictionary that facilitates the reader to find the appropriate word for specific contexts in the text they are writing or to understand a word through another with a related or opposite meaning. It is worth noting that this dictionary was developed entirely electronically, in a lexicographic database, which allowed meticulous checks for the correctness of its content and the consistency of references from one entry to another.