The crossword solution for the term 'prefix for 'NET' or 'NATIONAL'' is INTER, which is a five-letter word. INTER is a Latin prefix meaning 'BETWEEN, ' 'AMONG, ' or 'in the midst of.' It is commonly used in English to form words that refer to something that is BETWEEN two or more other things, such as international, interconnect, and internet. It is also used to form words that refer to something that is related to a nation, such as NATIONAL, nationalism, and interstate.