The term 'inner connection' can be summarized as a connection between two things that is not visible or tangible. It is often used to describe a spiritual or emotional bond between two people, or a connection between two ideas or concepts. The crossword solution for this term is 'SINEW, ' which refers to a type of connective tissue found in the body that connects muscles to bones. SINEW is also used figuratively to refer to strength or resilience.