Inter-penetration is a term that refers to the intersection or crossing between separate objects or entities. Synonyms for this word include intermingling, merging, blending, amalgamation, fusion, and integration. These terms describe the process or result of two or more things joining together to create a single entity, becoming more closely interconnected or intertwined. Other synonyms include interweaving, interlocking, entwining, interconnecting, and interlacing, which all suggest the connection between elements and their mutual blending. Whether used to describe physical matter, ideas, or relationships, these synonyms all suggest a degree of unification between separate elements.