Sometimes people say "etc., etc." at the end of a list to whimsically suggest many more items. Is this grammatical? Is it acceptable in a professional or academic context?
closed as primarily opinion-based by tchrist♦, Phil Sweet, MetaEd♦, user180089, Chenmunka Jul 29 '16 at 9:12
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Doubling words for emphasis is common in English - very very common in fact. This is despite the duplication having no semantic role.
A list finishing with etc. etc. is slightly different in that it's not exactly for emphasis, but to imply many more items, trailing off ad infinitum.
As regards usage, I wouldn't write it in a paper/thesis. I would be happy to use it in a talk, even on the slides. If your overall presentation style is at the formal/dry end of what I've seen, this might not fit so well, but if you aim more for a storytelling feel it would be absolutely fine.
Yes. That is, in an official context even:
Queen Beatrix's official title was Her Majesty the Queen of the Netherlands, Princess of Orange-Nassau, etc., etc., etc. The triple 'etc.' refers to the monarch's many dormant titles. [My bold.]
This link shows the list not to be infinite, but it is getting there...