Ksanti (pronounced: kshanti) is an ancient Sanskrit word. In Pali it becomes khanti.
It is the practice of exercising patience toward behavior or situations that might not necessarily deserve it and is seen as a conscious choice to actively give patience as if a gift, rather than being in a state of oppression in which one feels obligated to act in such a way.
and more in depth (from Transcribed talks by Ratnaghosa):
First of all, ksanti as patience...
We need to develop an attitude of patience towards both ourselves and others. Patience is the gap between our experience of being hurt and our response to being hurt. Without the gap there is simply a knee-jerk negative reaction. With the gap created by the exercise of patience there is a possibility of a more creative and positive response. We need to exercise patience in relation to others because we are all intimately connected by the threads of our common human consciousness....
We also need to practise patience towards ourselves. We need to be patient with our progress in the spiritual life. We cannot force-grow ourselves. We have to set up conducive conditions and make a consistent effort. Then we will grow. But we all grow and change at a different pace and in different ways. We need to be aware that spiritual progress is a process, a process of change that takes place on different levels of our being....We should also be patient with the spiritual growth of others....We need to be patient with others and expect them to be imperfect and forgive them for it.
R Stead, founder of Ksanti LLC, has published "Behind The Lines"—the true story of how his father, Jack W Stead, evaded capture after being shot down in France in April of 1944.