Noun form: Regression
Verb form: Regress
Congress is the opposite of Progress...
The joke is that, since pro- is opposite of con-, congress is the opposite of progress. Except for this, there is no antonym.
Now, literally speaking, "con" in congress refers to congregation, for the opposite of progress is regress. Unfortunately, many times congress does seem to be the opposite of progress, even if it may not be so in the meaning of the word. I believe this joke had been independently invented by many people (Great Minds Think Alike)
There isn't an opposite of chronology - the study of the progress with time of a series of related events such as geological ages or royal dynasties.
A congressman. It is memorable because CON is the opposite of PRO, and some feel congress is the opposite of progress.
back up, decline, retreat, stop
The word could be revert, or regress (the opposite of progress).
Technically "congress" means the coming together or meeting. It's a meeting of the representatives of different congressional districts around the nation. "If the opposite of PRO is CON, is the opposite of PROGRESS, CONGRESS?
The homophone of progress is "progrès", which means "progress" in French.
The opposite could be accepting, or increasing. It would depend on how you're using the word decline. If you mean to turn down an invitation, then accepting would be the opposite. But, if you're using decline to mean a lessening or diminishment, such as a decline in the population growth rate, then increasing would be the opposite of declining.
That is the correct spelling of "progress" (advancement).
The noun of "progress" is "taqaddom" (تقدم) The verb of "to progress" is "taqaddama" (تقدم)