incoming has the recorded history: A native English compound of in- ('in') + the present participle of come, from Old English cuman ('to come'). Morphologically, the word is best read through the components named in the history, with the modern spelling preserving a compound structure rather than a single unanalyzable stem. In present English, the adjective sense is "coming in or arriving; about to take up a position", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as incomer, income, and come. Its semantic neighborhood includes arriving, entering, approaching, and succeeding, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Old English cuman and Proto-Indo-European *kʷemH-.