4 levels of concentration

Four levels of concentration:

1. Momentary or transient concentration (khanika-samadhi)

2. Preliminary or preparing concentration (parikamma-samadh)

3. Access or approaching concentration (upacara-samadhi)

4. Absorption or attainment concentration (appana-samadhi)

References

• The Complete Book of Buddha's Lists -- Explained. David N. Snyder, Ph.D., 2006.
• http://www.thedhamma.com/