Yep. It talks about the noun and verb "concert". It doesn't mention "concerted" though, which is the word I'm interested in. These words are obviously related, but in determining the definition of a word, one typically looks to the explicit definition — not to the definitions of related words.
If "concerted" can also have the meaning that you describe (and that I grew up believing in), then why isn't this meaning/usage included in any definition for "concerted"?
Yes, it does. Here is the entire verb entry from that link:
1690s, "to contrive, adjust;" 1707, "to contrive and arrange mutually," from French concerter and directly from Italian concertare "to bring into agreement" (see concert (n.)). Related: Concerted; concerting
Yeah, I meant that it doesn't mention it anywhere near where it talks about striving (which was what caio1982 had asserted was the meaning). That only appears in the discussion of the noun "concert". I should have worded that more clearly.
If you can't provide any direct support for your position (which is contradicted by dictionary definitions [1-3] and a forum discussion on the topic [4]), I won't continue to engage. Good day!
Note also that your link #4 references the Oxford English Dictionary, which is where the first link I give above comes from. The argument given in your link #4 seems plausible, but given the fact that there are reputable sources leaning both ways, I don't think you can say the single person usage is simply wrong. Perhaps "uncommon" might be a better term.
Thanks for adding these to the discussion. This was the sort of thing that I was hoping others would contribute.
It's an interesting question as to what a word means when dictionaries differ. In some cases, the differences might exist on a spectrum (e.g., is "furious" more upset than "livid"). But in this case, we have a completely separate meaning that some dictionaries bless but others do not hint at.
I would be curious to see whether there are historical trends here, which might hint if we're headed in one direction or the other.
https://www.etymonline.com/word/concerted says it is a past participle of "concern". Not sure if it is correct, but it makes some sense if viewed with this in mind?