It is elementary, that when you write about a term you should give its definition. In the case of corruption, we all know what is meant. This agreement does not help to get closer to a precise meaning that satisfies everybody at all times. Those that admit this and persist to give a definition are either fools or they write a weekly column. It is quite likely that the “or” can be omitted.
Its omnipresence is what makes “corruption” as slippery as a freshly caught fish. We often become unaware participants because an innocent aspect is implied. This can make actions that open privileged opportunities not legally actionable and these are therefore not criminal. When I got my Swiss citizenship an official had to determine whether I am integrated. Due to assumptions he had reason to make in the light of my training, he skipped the obligatory questions about society and politics. Once he found out that I am a member of a local pistol club, being a participant himself, he visibly concluded that I “belong”. The case gets more complicated once other shared interests are exploited to pull the cart of a firm. For good reason, retired politicians are in demand as lobbyists. For the same reason, many countries limit their lobbying.