The term 'Former Senior' can be broken down into two crossword solutions: ALUM and GRAD. ALUM is a shortened form of the word alumnus, which is a male former student or graduate of a school, college, or university. GRAD is a shortened form of the word graduate, which is a person who has successfully completed a degree or course of study at a school, college, or university. Therefore, the term 'Former Senior' refers to a person who has previously attended and graduated from a school, college, or university.