Definition of first determiner from the Oxford Advanced American Dictionary

      

    first

     determiner,ordinal number
    determiner, ordinal number
    NAmE//fərst//
     
     
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  1. 1 happening or coming before all other similar things or people; 1st his first wife It was the first time they had ever met. I didn't take the first bus. students in their first year of college your first impressions She resolved to do it at the first (= earliest) opportunity. King Edward I (= said as “King Edward the First”) May 1st/the first of May His second book is better than his first.
  2. 2the most important or best Your first duty is to your family. She won first prize in the competition. an issue of the first importance
  3. Idioms
    there's a first time for everything(saying)(humorous)
     
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    the fact that something has not happened before does not mean that it will never happen
See the Oxford Advanced Learner's Dictionary entry: first