Dancing Red Feather - Though the specific word, 'Rapture' is not in the original texts (Hebrew, Aramaic, Greek, et al), the word was properly coined because it is the only reasonable, thus logical description of what the actual words mean.
Note though, the question of whether the Rapture is Pre/Mid/Post Tribulation is and will until the Rapture occurs, be arguable. You can go to one seminar supporting Pre, as an example, and be presented with plenty of Bible verses and concepts to convince you that Pre-Tribulation is in fact correct. Then you can go to a seminar on Mid and then on Post and receive the same appreciation. The end result is that while believing the Rapture will occur, you will remain somewhat confused because of the question of Pre/Mid/Post. To a degree each sounds right. And certainly, only one will become true.
In that God is not a God of confusion - then it stands to reason that although each in depth discussion is valuable because of the Bible education received, God would prefer we not get caught up in the dilemma that question is apt to bring forth.
Rather, God wants us to focus on what He deems to be vastly more important: Insuring we are in fact Saved specifically according to John 3:3.
You may wish to review a couple of sites I have on this and other Biblical subjects as well as follow the links suggested in order to gain a wide range of knowledge and understanding on the subject. I also have a few HUBs under... hubhub2 that may interest you.
Good luck to you as you continue to seek Truth.