Samkhara; As a result of this lack of understanding, there arises samkhara. The Pali word samkhara has many meanings and does not translate directly into English. But in the context of Dependent Origination, it may be termed mental formations which generate kamma.
In general, Samkhara has a much broader and deep meaning than above. It is defined as "things that have come into existence due to causes and conditions that are subject to continuous change". It includes such factors as skillful and unskillful intentional actions, memory, habit formations set up in the past. All skillful and unskillful thoughts, words and actions are also included in this category. It could be said that samkhara is the momentum generated by the above factors that propels a being through samsara.