You still miss the point that determine or its past tense, determined, isn't the same thing as adding ism at the end which totally changes the meaning. The word you are for some reason avoiding is determination.
O.K. Anthony. Self determination. Thank you. You still have to look at the word from a verb point of view though to see the concept. He is trying to determine what happens.
If someone told me someone has great determination (noun) I would see he decides for himself, he determines what happens uninfluenced, focussed.
So I will use your more grammatically correct definition.