The term 'prefix for CYCLE' refers to four different prefixes that can be used to modify the word 'CYCLE'. The prefixes are TRI (3 letters), UNI (3 letters), EPI (3 letters), and MEGA (4 letters). TRI is a prefix meaning three, UNI is a prefix meaning one, EPI is a prefix meaning upon or around, and MEGA is a prefix meaning large or great. Therefore, these prefixes can be used to describe cycles that involve three, one, around, or large/great elements.