Publishing houses that publish dictionaries have editorial teams that constantly check and revise the content of the dictionary, and also see what words are used in daily language, and how their meanings change over time.
If a new word appears on the “radar”, they will observe, how widespread it is, and then decide if they should include it in the dictionary.
They also “weed out” words that are no longer in use and remove them from the dictionary – or at least from the “smaller” editions. Usually there is also a flagship dictionary which also contains old words and older uses.
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