Question: Sentence 1: He was admitted to the bar in New Jersey.
Sentence 2: Unfortunately some writers have used bar for one dyne per square centimeter.
Does bar mean the same thing in these two sentences?
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Answer: different meanings

Question: Sentence 1: An estimate of what it would cost.
Sentence 2: Many factors are involved in any estimate of human life.
Does estimate mean the same thing in these two sentences?
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Answer: different meanings

Question: Sentence 1: Strike 'z' on the keyboard.
Sentence 2: The pianist strikes a middle C.
Does strike mean the same thing in these two sentences?
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Answer:
the same meaning