The term 'immediately following' can be expressed in a variety of ways, including 'hereon' (6 letters), 'NEXT' (4 letters), 'UPON' (4 letters), and 'rightafter' (10 letters). These words all indicate that something is happening directly after another event or action. For example, if someone says 'we will start hereon, ' they mean that they will begin immediately after the current moment. Similarly, if someone says 'we will start NEXT, ' they mean that they will begin right away after the current event. 'UPON' and 'rightafter' have similar meanings, but the latter is more specific and implies that something is happening directly after another event.