1 a: a judicial decision settling and ending a controversy b: the resolving of a question by argument or reasoning 2archaic:termination 3 a: the act of deciding definitely and firmly; also: the result of such an act of decision b: firm or fixed intention to achieve a desired end <a woman of great courage and determination> 4: a fixing or finding of the position, magnitude, value, or character of something: as a: the act, process, or result of an accurate measurement b: an identification of the taxonomic position of a plant or animal 5 a: the definition of a concept in logic by its essential constituents b: the addition of a differentia to a concept to limit its denotation 6: direction or tendency to a certain end :impulsion 7: the fixation of the destiny of undifferentiated embryonic tissue