Dictionary Definition :
Definition[1]
:
The esoteric Mantra or Yogācāra sect, developed especially in眞言Shingon, with Vairocana 大日如來 as the chief object of worship, and the maṇḍalas of the Garbhadhātu and Vajra- dhātu.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous