Definitions for "Kamma"
intention or volition which may be wholesome or unwholesome; it is also the deed motivated by volition.
intentional action or cause leading to an effect.
For Buddhism, as in Hinduism, this is the moral law of cause and effect. People build up karma (both good and bad) as a result of their actions. This then determines the state of existence to which one is reborn after birth. In Buddhism, the different levels can include hells, humans or animals in this world, or one of several heavens.