inexistence comes from in- ('not') + existence, from Late Latin existentia, from Latin existere ('to come forth, exist'), from ex- ('out') + sistere ('to stand, take a stand'). Morphologically, the prefixed shape matters: the initial element belongs to the recorded formation and helps explain the modern form's surface analysis. In present English, the noun sense is "the state of not existing; nonexistence", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as inexistent, exist, existence, and existent. Its semantic neighborhood includes nonexistence, nonentity, nothingness, and absence, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin existere and Latin sistere.