first (EN)
adjective, adverb, noun

adjective “first”

first, non-gradable
  1. coming before all others in time or order
    My first attempt at baking a cake was a complete disaster.
  2. the most important or highest ranking
    In her field, she is regarded as the first authority on genetic research.
  3. associated with the highest-ranked family in a country
    The first lady of the country is the wife of the president.

adverb “first”

first
  1. before doing anything else
    First, let's go over the safety procedures before we start the experiment.
  2. occurring at the beginning or as a new occurrence
    She first met her future husband at a friend's wedding.

noun “first”

sg. first, pl. firsts or uncountable
  1. the individual or item that is ranked at the top in a sequence
    She was the first in the race.
  2. the lowest gear in a vehicle's transmission
    After starting the car, make sure it's in first before you pull away from the curb.
  3. an event or instance that is happening for the first time
    His invention was a first in the field of renewable energy technology.