Difference between "reflection" and "reflexion" [closed]
Reflexion is used in British English to mean reflection. It is seldom used these days.
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’.