Infix is a term used in grammar and linguistics to refer to a word or phrase that is inserted into another word or phrase. The crossword solutions for this term are INSERT (6 letters), IMPLANT (7 letters), ENTRENCH (8 letters), LODGE (5 letters), EMBED (5 letters), and IMBED (5 letters). These words all have similar meanings, which involve inserting something into something else. For example, to INSERT something is to put it into a space, while to IMPLANT something is to INSERT it firmly into something else. To ENTRENCH something is to firmly EMBED it into something else, while to LODGE something is to place it firmly in a particular spot. Finally, to EMBED and to IMBED something is to fix it firmly into something else.