The mention of the word "political" when defining "agenda," usually at the very end of the list of ways to use the word "agenda" in a sentence is part of all 21st century definitions, and by exploring my list of research sources even if you too will determine the same conclusion, it will be elucidating to ponder the differences between the words and their definitions.
In the 21st century, the word "political" is essentially defined in connection with government, but then the word "agenda" is coupled for a fuller definition of the word "political" to include even what are described as think tanks.
However, the mention of another definition of "political" without the use of the word "agenda" is not applied in a 21st century definition, although it is possible to apply the definition of the word "political" to any group of people who can congregate together, for instance, they live in the same apartment building, or attend the same house of worship, all of which are not necessarily a government.
On the other hand, the 21st century definition is the same as it was in the past when referring to the word "agenda," which is similar in all the sources I found on the internet, and is solely applied to a plan of some sort, also a timetable for whatever may be included in that list of items, no matter what the use of the listed.
Nonetheless, I have concluded there is a 21st century slant to defining the words "political" and "agenda" mainly with the coupling of the aforementioned words to "political agenda," but this is a phenomena that applies to our modern day language lexicon, and this is why I have researched these particular words and their definitions in this words and meanings blogspot post. I believe it is more important to redefine in context these once very common words, "politics" and "agenda" to identify what is a 21st century of "historic" firsts when it comes to the "agenda" of a "political" hierarchy on the global world stage that affects us all, no matter what our political persuasion.