Question: Here is one sentence: There was a dullness in his heart.
Here is another sentence: Without him the dullness of her life crept into her work no matter how she tried to compartmentalize it.
Does the dullness mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: American industry is making increased use of computers to control production.
Here is another sentence: Frugality and industry are still regarded as virtues.
Does the industry mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: A unit of wheat is a bushel.
Here is another sentence: The dollar is the United States unit of currency.
Does the unit mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: She's an elegant dresser.
Here is another sentence: He's a very snappy dresser.
Does the dresser mean the same thing in the two sentences?

Answer:
the same meaning