Option 1: Language Settings

Settings > Language & Region > Keyboard Settings > Text

Similar to the iPhone, your mac can add text shortcuts.

1. Go to System Preferences
2. Choose Language and Region
3. Click on Keyboard Preferences
4. Choose Text
5. Add “Latinx” as a shortcut by clicking on the + on the bottom left then entering the word.

Option 2: Right-Click

In any app you’re using, you can right-click on the word and choose either “add” or “learn” to include it in that program’s dictionary.  You may have to do this for each program (like your web browser, word editor, etc.)

Option 3: Script Editor

This one can be a little intimidating, but it’s just cut and paste.

1) Open the Script Editor program (you can get to it by searching in spotlight)

2) Paste the following

set additions to “”
set finished to false
repeat until finished is true
display dialog ¬
“Enter the next word to add to the user dictionary.” & return & ¬
“Press the Finished button when you’re finished” with title ¬
“Add words to spelling dictionary” default answer ¬
“” buttons {“Cancel”, “Finished”, “Add word”} default button 3
if button returned of the result is “Finished” then
exit repeat
else
set additions to ¬
(additions & the text returned of the result as text) ¬
& (ASCII character 0)
end if
end repeat

set spellingFolderPath to (path to library folder from user domain as Unicode text) & “Spelling:”
try
— Test the existence of the “Spelling” folder.
   spellingFolderPath as alias
on error
— If there’s no “Spelling” folder in the user Library, create one and, inside it,
   — an empty file named after the code for the user’s preferred spelling language.
   set spellingFolderPOSIX to quoted form of POSIX path of spellingFolderPath
do shell script “defaults read ‘Apple Global Domain’ ‘AppleLanguages'”
set preferredLang to text from word 1 to word -1 of text 1 thru (offset of “,” in result) of result
do shell script (“mkdir “ & spellingFolderPOSIX & ” ; echo -n ” > “ & spellingFolderPOSIX & preferredLang)
end try

set UserFile to choose file with prompt ¬
“Please choose the dictionary file to add the words to.” default location ¬
alias spellingFolderPath
set fileRef to open for access UserFile with write permission
try
write additions to fileRef starting at eof
end try
close access fileRef

3) Hit run
4) Add “Latinx,” choose “add word,” then “finished.”
5) Tell it to add it to your local dictionary.

Adapted from MacScripter

Option 1: Custom Dictionary

The following instructions are for any of the Microsoft Office products.

1. Select the File tab
2. Select Options.
3. Select Proofing.
4. Make sure the Suggest from main dictionary only checkbox does not have a mark in it.
5. Click on Custom Dictionaries.
6. Click New
7. Give the dictionary a name.If you want the new dictionary to be used for another language, while the new dictionary is still selected in the Dictionary List, select the language on the Dictionary language menu.
8. Click Edit Word List.
9. Type “Latinx” it in the Word(s) box, and then click Add.

Adapted from Microsoft Office Support.

*If you have better suggestions, please add them in the comment section below!