Kriya = Action + State of awakened kundalini

Kriya (in Sanskrit “action, deed, effort”) most commonly refers to a technique or practice within a yoga discipline, also the outward physical manifestations of awakened kundalini. Types of kriya may vary widely between different schools of yoga. Kriyas are the spontaneous movements resulting from the awakening of Kundalini energy. Certain kriyas eventually developed into the asanas of hatha yoga.

Kriya Shakti is “a power of thought” said to be greatly studied by yogis. Among the specific Kriya practices are: Kriya Yoga and other techniques.


http://en.wikipedia.org/wiki/Kriya