Adding a new word to a dictionary is a laborious process.
They begin by gathering citations for the word, documenting the source, and recording its contextual meaning. Then, lexicographers conduct database research, looking for evidence that people from various backgrounds used the word over time. Finally, dictionary editors look over the evidence and decide whether or not to include the new word in a future edition of the dictionary. As a result of this lengthy process, modern words like manspread, presstitute, and athleisure can now be found in several dictionaries.