inbeing

noun

existence in something else; inherence

basic and inward nature; essence

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for inbeing

Historical Examples of inbeing

So, when formless and indefinite matter was once formed by the inbeing soul, it received such a form and disposition.
Essays and Miscellanies
Plutarch