Q: Does the word "spring" mean the same thing in "He will hold office until the spring of next year." and "You can visit me in the spring, when the weather is bearable."?

A: the same meaning

Q: Does the word "union" mean the same thing in "The union of opposing factions." and "The Soviet Union."?

A: different meanings

Q: Does the word "solution" mean the same thing in "The solution took three hours." and "They were trying to find a peaceful solution."?

A: different meanings

Q: Does the word "back" mean the same thing in "The back of the dental chair was adjustable." and "He stood at the back of the stage."?

A:
different meanings