Q: Does "mail" have the same meaning in the following two sentences?

He works for the United States mail service.

The mail handles billions of items every day.

A: the same meaning

Q: Does "number" have the same meaning in the following two sentences?

This sweater is an all-wool number.

It was one of the best numbers he ever did.

A: different meanings

Q: Does "stage" have the same meaning in the following two sentences?

The stage pulled into town carrying the payroll for the mill and three ladies.

At what stage are the social sciences?

A:
different meanings