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

(The believers ... those ...) who abstain from sex.

All you ever think about is sex.

A: the same meaning

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

The sudden apparition of the Spaniards. -- William H. Prescott.

The apparition of Lawyer Clippurse occasioned much speculation in that portion of the world. -- Sir W. Scott.

A: the same meaning

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

The police are following a promising lead.

We were just waiting for someone to take the lead.

A:
different meanings