The crossword solution for the term 'PREFIX FOR 'FINAL' OR 'CIRCLE'' is 'SEMI' (4 letters). A prefix is a word or group of letters added to the beginning of a word to change its meaning. In this case, the prefix 'SEMI' is used to modify the words 'FINAL' and 'CIRCLE' to indicate something that is incomplete or partial. For example, 'SEMI-FINAL' would refer to a competition in which two competitors compete before the FINAL round, while 'SEMI-CIRCLE' would refer to a shape that is only half of a CIRCLE.