Expulsion comes from Latin expulsionem, from expellere ('to drive out'), from ex- ('out') + pellere ('to drive, push'). Morphologically, the form is compositional: ex- marks part of the visible structure, while the remaining element supplies the lexical base. In present use, it is used as a noun meaning "the act of forcing someone to leave a place or organization", so the historical material remains connected with the current sense rather than standing as bare ancestry. The wider English family includes related forms such as expel, expulsive, and expellable, showing how the same historical material continues to organize neighboring vocabulary. The named historical forms include Latin expulsio and Latin pellere, keeping the history tied to concrete forms rather than a loose resemblance. Its semantic neighborhood is marked by ejection, eviction, removal, and banishment on one side and contrasts such as admission, admittance, and inclusion on the other, locating the modern specialization without adding a new origin story.