In the Pali Canon, an Arahat is a "perfected person, one who has gained insight into the true nature of existence and has achieved nirvana (spiritual enlightenment).
Arhat (अर्हत्) is the Sanskrit word for deserving/worthy/venerable.
An Arhat Buddha (अर्हत् बुद्ध)is an awakened one (who knows and understand) who has perfected themselves (i.e. is fully Aligned) and therefore, in LP nomenclature, is worthy and capable of full Connection
- Davids, T. W. Rhys. The Book of the Great Decease - the Maha-Parinibbana-Sutta. Trans. Davids, Translated from Pali by T. W. Rhys. Kindle Edition ed: Amazon Digital Services.