I'll offer two additional definitions for 'politics':

(1) The means whereby groups of people struggle to get what they want

(2) The rationale used for ignoring moral and ethical concepts by relabeling them 'politics'.  Example:

American Catholics denounce the murder of innocents when it comes to abortion-on-demand, but not when it comes to the El-Salvadoran government murdering Archbishops, nuns and their housekeepers (and said housekeepers' children).  Then it somehow magically transforms into "politics."  Perhaps because the late and un-lamented Ronald Reagan "greatly communicated" they should think that way ('think' used in the broadest possible sense of the term).

In Arabic we call this "fasiq" (hypocrisy).