first propagation
Dictionary Definition :
Definition[1]
:
First Propagation (Tibetan, snga-dar). The initial period of dissemination of Buddhist teachings in Tibet which came to an end during the suppression of Buddhism by Lang Darma in the mid-9th century ce.
Source
:
A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)