The crossword solution for the term PARTIAL: PREF. is SEMI, which is a four-letter word. The word SEMI is derived from the Latin word 'SEMI', meaning 'HALF'. It is used to describe something that is only partially complete or done, or something that is only partially true or accurate. It is also used to describe something that is halfway between two extremes. For example, a SEMI-circle is HALF of a circle, and a SEMI-trailer is a trailer that is only partially attached to a truck.