La pieza

la_pieza_test.rb

class Word
  def initialize(w = "foo", m = "bar")
    @w = w
    @m = m
  end
  
  def word
    @w
  end
  
  def meaning
    @m
  end
end

class Dictionary
  def initialize(a = [])
    @a = a
  end
  
  def find_meaning(n)
    r = @a.select{ |item| item.word == n }
    return r.first.meaning if r
  end
end

apple = Word.new('apple', 'A fruit')

p apple.word == 'apple' # => true

p apple.meaning == 'A fruit' # => true

car = Word.new('car', 'A transport')

dictionary = Dictionary.new([apple, car])

p dictionary.find_meaning('apple') == 'A fruit' # => true

p dictionary.find_meaning('car') == 'A transport' # => true