Firmness of purpose; resolve: approached the task with determination. A fixed intention or resolution: returned to school with a determination to finish. The ascertaining or fixing of the quantity, quality, position, or character of something: a determination of the ship's longitude; a determination of the universe's mass. The result of such ascertaining. The act of making or arriving at a decision: After long determination, she decided to move to Utah. The decision reached: It is my determination to sell the house. See Synonyms at decision. The settling of a question or case by an authoritative decision or pronouncement, especially by a judicial body: The choice of a foster home was left to the determination of the court. The decision or pronouncement made. The bringing about of a result or outcome: the determination of hair color by the genes. Archaic A fixed movement or tendency toward an object or end. Logic The defining of a concept through its constituent elements. The qualification of a concept or proposition to render it more definite or specific.