Aro Dictionary

yana

An approach within Buddhism. A yana is a coherent system of theory and practice that carries one from a base via a path to a particular result. Literally, yana means ‘vehicle’, and it is sometimes translated that way. 
Yanas may be classified in several ways. In Aro, and the Nyingma tradition generally, the three primary yanas are Dzogchen, Tantrayana, and Sutrayana. Tantrayana is then divided into inner Tantra and outer Tantra, both of which have their own subdivisions. Sutrayana consists of Hinayana and Mahayana.
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