Definition of oneing in English:

oneing

Pronunciation /ˈwʌnɪŋ/

noun

  • The action of "one"; an instance of this; union, fusion; unity, peace.

    Unlike the verb on which it is formed, the verbal noun appears to have become obsolete in the 15th or 16th century and to have been consciously revived in the 19th, especially in Christian theological contexts.

Origin

Middle English; earliest use found in Ayenbite of Inwyt. From one + -ing.