Transitional period is a term used to describe a period of time in which a change or transition is taking place. The two crossword solutions for this term are PHASE and MEANTIME. A PHASE is a distinct period or stage in a process of change or development, while MEANTIME is an intervening period of time. Together, these two words can be used to describe a transitional period, which is a period of time in which a change or transition is occurring.