The term "after-most" refers to the part of something or someone that is located farthest towards the rear end, or following in sequence. Its antonyms would be the words frontmost or foremost, which describe the exact opposite, the forefront, or the beginning. For example, in a line of people waiting to enter a building, the person at the frontmost location will be the first to enter. In contrast, the person at the aftermost location in the same line will be the last one to enter. Understanding antonyms provides a better understanding of language and helps to clarify meanings of words in different contexts.