Entry 2 senses · 2 variants Webster, 1913 oncoming · IPA /ˈɔnkˌʌmɪŋ/ adj. n. 01 adj. moving toward one; approaching. 1. moving toward one; approaching. Syn. approaching. 02 n. the beginning or early stages; the onset. 1. the beginning or early stages; the onset. Syn. onset.