impassion comes from Italian impassionare or French impassioner, from in- ('in') + passion, ultimately from Latin passio ('suffering'), from pati ('to suffer'). 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 verb sense is "to fill with intense feeling or passion", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as passion, passionate, and compassion, and in derivatives such as impassioned and impassioning. Its semantic neighborhood includes inflame, excite, arouse, and kindle, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin passio and Latin pati.