kənˈkluːʒən dɪˈsɪʒən dɪˌtɜːmɪˈneɪʃən ˈfaɪndɪŋ the act of determining the properties of something, usually by research or calculation the determination of molecular structures the act of making up your mind about something the burden of decision was his he drew his conclusions quickly the quality of being determined to do or achieve something; firmness of purpose his determination showed in his every movement he is a man of purpose deciding or controlling something's outcome or nature the determination of grammatical inflections a position or opinion or judgment reached after consideration a decision unfavorable to the opposition his conclusion took the evidence into account satisfied with the panel's determination