The term 'ACT OF COMING IN' can be represented by two crossword solutions: 'ENTRY' (5 letters) and 'ARRIVAL' (7 letters). ENTRY is defined as the act of entering or coming in, while ARRIVAL is defined as the act of arriving at a place. Both words are used to describe the same concept, but ENTRY is more commonly used when referring to the act of entering a physical space, while ARRIVAL is more commonly used when referring to the act of arriving at a destination.