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The phrase "or earlier" is correct and commonly used in written English.
It is typically used in a sentence to indicate that something may occur at a certain time or even before that time. For example: 1. "The party starts at 8 pm, but you can arrive at 7:30 pm or earlier if you'd like." 2. "Please submit your report by Friday at noon, or earlier if possible." 3. "The doctor's appointment is at 9 am, but they may be able to see you at 8:30 am or earlier if there is a cancellation." 4. "The deadline to apply for the scholarship is June 1st, but it is recommended to submit your application or earlier to ensure consideration." In all of these examples, "or earlier" is used to indicate that a certain action or event can happen before the specified time. It provides flexibility and suggests that earlier is also acceptable.
Exact(60)
Or earlier.
Or earlier, under Eisenhower?
Switch back to AMS 2.05 or earlier.
Manuscripts due at Symposium or earlier.
Our goal should be kindergarten or earlier.
If you are using Java 6 or earlier, please upgrade.
If you are using Java 7 or earlier, please upgrade.
Not that long ago, in 2010 or earlier, it wasn't.
†Chem 12B = Chem 112B for Spring 2017 or earlier.
China's emissions will reach their peak by 2030 "or earlier".
School typically starts at 7 30 a.m. or earlier.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com