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When is one used instead of the other?

Is there a reason to use one or the other? Or is just two words that can be used without problems?

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closed as general reference by J.R., MετάEd, Matt E. Эллен, Mahnax, tchrist Sep 6 '12 at 2:54

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

-1 and voted to close as general reference, it was in the first dictionary via Google: thefreedictionary.com/_/dict.aspx?word=reflexion – Hugo Nov 16 '11 at 21:36
While I undertand that both are the same word with different spellings, I like to think of reflections as contemplations, while reflexions seem more like spontaneous responses. – user25597 Sep 2 '12 at 2:13
up vote 4 down vote accepted

Reflexion is used in British English to mean reflection. It is seldom used these days.

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The same word, two spellings. Oxford English Dictionary...

The spelling reflection is now much commoner than reflexion in all uses, probably largely as a result of association with reflect v.; compare also flexion n., connection n., etc. N.E.D. (1905 ) notes that the spelling reflexion was then ‘still common in scientific use, perhaps through its connexion with reflex’.

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