Arabic WordNet 4.0 is a comprehensive lexical database for Modern Standard Arabic, derived from the Open English WordNet using the expand approach. **Features:**- 109,823 synsets (100% OEWN coverage)- 124,653 lexical entries- 166,643 senses- 265,676 synset relations- 97.2% ILI coverage for cross-linguistic linking- Full WN-LMF 1.4 XML format compliance **Methodology:**Translations were generated using AI-assisted translation (Google Gemini 3 Pro Preview) following the expand approach for WordNet construction. **Attribution:**This resource is derived from Open English WordNet (CC BY 4.0), which is based on Princeton WordNet 3.0.