ONCOMER Meaning of ONCOMER in English ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ nounEtymology: on + comer (after come on, v.): comer 2 oncomers being developed for our international teams — Lawn Tennis & Badminton Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012