It's in Biographia chapter 9; in a section where Coleridge is gently mocking Fichte:
Thus his theory degenerated into a crude egoismus, a boastful and hyperstoic hostility to NATURE, as lifeless, godless, and altogether unholy: while his religion consisted in the assumption of a mere ORDO ORDINANS, which we were permitted exotericé to call GOD; and his ethics in an ascetic, and almost monkish, mortification of the natural passions and desires.The Princeton edition of the Biographia, edited by stalwarts Engell and Jackson Bate, gloss the word as meaning 'popularly', but I don't see where they get that from (they give no source). I can't, indeed, find a definition -- except that presumably it is from the Latin 'exoticus' ('foreign, exotic'). Google books returns but one instance of the word's usage that isn't Coleridge's Biographia: Georg Conrad Bergius and Johann Christoph Neander's Disputatio civilis (1653), where it's used (with, as in Coleridge, an accent on terminal 'e') to mean 'foreign' or 'exotic'. Isn't it likely that's what Coleridge meant, too? I'd gloss '... which we were permitted exotericé to call GOD' as '... which we were permitted unusually, or as a special concession to call GOD'. Am I wrong?