1. The logic of pure being, or being in the element of pure thought; metaphysics.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• astology,
• ontologty,
• oncolgy,
• onocology,
• anaology,
• onclogy,
• anology,
• onthology,
• onoclogy,
• annology,
• eitology,
• otnology,
• antology,
• deontology,
• aetology,
• fetologyy,
• nosoloby,
• odontilogy,
• odontlogy,
• odontolgy

• ontological.

The adjective form of "ontology" is "ontological".

The plural of the "ontology" can be the "ontologies".

The singular of the "ontology" can be the "ontology".