Are there any relationship between "get rid of" & "annul"?

[Odessa Dawn]

Morsi got rid of the man who was expected to replace Tantawi – the army chief of staff, Sami Enan – as well as the leader of every service of the armed forces. Tantawi's replacement, the head of military intelligence Abdel-Fatah el-Sissi, will now report to Morsi himself, not to Scaf. Further, Morsi annulled the constitutional power grab that Scaf made on the second day of the presidential election in June, which gave the military a right of veto over the new constitution that is in the process of being drawn up.

As we know that sometimes dictionaries can't satisfy our want when it comes to context. So, without dictionary, do the aforementioned words have close meaning?

[abaka]

Both share a general sense of discarding.

To get rid of something or someone is essentially to throw it (or them) away.

To annul means to cancel, in such a way that whatever is annulled is assumed never to have existed at all.

"To get rid of" is common English. "To annul" is definitely somewhat formal, though not excessively so.

There is no etymological connection between the two.

[SlickVic9000]

(Not a Teacher)

Not exactly. I'd say "annul" is closer in meaning to "cancel" or "void". It's only used with legislation or legally binding agreements such as contracts.

"Get rid of" is closer to "eliminate", "dispose of", or "do away with".

[abaka]

I don't think there is any difference in the posts #2 and #3 interpret the two.