The term RELAY PORTION can be broken down into two parts: LAP (3 letters) and LEG (3 letters). A LAP is a single circuit of a track or course, while a LEG is a section of a journey or race. In the context of a relay race, each participant runs one LAP or LEG of the race before passing the baton to the next runner. Therefore, the term RELAY PORTION refers to the part of the race that each individual runner is responsible for.