Triggered by an interesting but speculative and open-ended discussion in a scientific blog article, I want to ask what the meaning of research is/was according to its etymological history. Maybe the knowledge here and wizard-like tools like ngram can shed more light on this question, at least I would like to see how people interpret/vote research. Please do not just simply reword different theories in this blog article, but add some traceable clues or a analysis how the meaning of the word changed gradually.
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The OED says:
So it appears the English was, if not borrowed from the French, at least modelled on it; and the French word already had something like the modern meaning.
Under "re-" the OED says: "The original sense of re- in Latin is ‘back’ or ‘backwards’, but in the large number of words in which it occurs it shows various shades of meaning ... ", but it does not give a meaning specifically which would account for the sense of "rechercher/research"
That article you linked to is interesting. The author of it had already considered the OED definition that Colin cited, but poses two alternative theories about the meaning or history of the word recherche and asks readers to vote. Basically, one theory is that recherche means to search intensely or thoroughly, and one theory is that it means to literally search again.
I think, given that reproducibility is one of the main principles of the scientific method, it is not a far stretch to think research means to search and search again. Scientists do like to think they're doing new-search, as the blog you reference states, but the work (whether an experiment or study) has to be reproduced by someone else working independently.
So if I were to vote on that blog, I'd pick Theory B. I hope someone who knows French might weigh in.