The term 'Alphabetical Run' refers to a sequence of words or letters that are arranged in alphabetical order. In this case, the crossword solutions are STU (3 letters), CDE (3 letters), EFG (3 letters), ABCD (4 letters), CDEF (4 letters), MNOP (4 letters), RSTU (4 letters), and IJKLM (5 letters). This sequence of words and letters is arranged in alphabetical order, starting with STU and ending with IJKLM.