Problem: Sentence1: I hope to become one of their number before I die.
Sentence2: This sweater is an all-wool number.
Q: Does the term number mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: He tried to sing the tenor part.
Sentence2: His part was right in the middle.
Q: Does the term part mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: To admit a serious thought into the mind.
Sentence2: A ticket admits one into a playhouse.
Q: Does the term admit mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: He works on commission.
Sentence2: A reseller's commission.
Q: Does the term commission mean the same thing in both these sentences?

Answer:
the same meaning