For a particular purpose. / Created on the spur of the moment; impromptu. / (sciences, of a hypothesis) Postulated solely to save a theory from being falsified, without making any new predictions.

On the spur of the moment. / For a particular purpose.

Endlessly; for ever; neverendingly.

An advertisement that stretches across (most often the top of) a web site.

Misspelling of ad hominem.

Short for argumentum ad hominem: A fallacious objection to an argument or factual claim by appealing to a characteristic or belief of the person making the argument or claim, rather than by addressing the substance of the argument or producing evidence against the claim; an attempt to argue against an opponent's idea by discrediting the opponent themself.

Of or relating to this kind of fallacious objection.

In an ad hominem manner.

To a nauseating or sickening degree. / Having been done or repeated so often that it has become annoying or tiresome.

A person who ad-libs, particularly one who is well known for skill in ad-libbing.