Here's a breakdown of its origins:
* "et" means "and"
* "cetera" is the plural form of "cetus," meaning "the rest"
The phrase was originally used in Latin texts to indicate that a list or enumeration was incomplete, and that there were further items that could be added.
Over time, the phrase was adopted into English and shortened to "etc." or "etcetera." It remains a common abbreviation used to indicate that a list or description is not exhaustive.