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https://en.oxforddictionaries.com/definition/gottenFrom the spelling "favorite", that is an American dictionary so would use the word gotten which is American not English
There is nothing to say we cannot use words from another country - English is full of words from other languages. The pic below does say 'gotten' is not used in British English, but it dates back to Middle English - which I assume is from the British Isles.From the spelling "favorite", that is an American dictionary so would use the word gotten which is American not English
Try a whole sentence in Middle English and see how far people get with understanding you without any modern English words for context.
One rests one's case - about as understandable as going to Walsall.Þiss boc iss nemmnedd Orrmulum, Forr þi þatt Orrm itt wrohhte. Icc hafe wennd inntill Ennglissh Goddspelless hallghe láre, Affterr þatt little witt þatt me Min Drihhtin hafeþþ lenedd.
Siþen þe sege and þe assaut watz sesed at troye Þe bor3 brittened and brent to brondez and askez Þe tulk þat þe trammes of tresoun þer wro3t Qatz tried for his tricherie þe trewest on erþe Hit watz ennias þe athel and his highe kynde Þat siþen depreced prouinces and patrounes bicome Welne3e of al þe wele in þe west iles Fro riche romulus to rome ricchis hym swyþe With gret bobbaunce þat bur3e he biges vpon fyrst And neuenes hit his aune nome as hit now hat Ticius to tuskan and teldes bigynnes Langaberde in lumbardie lyftes vp homes And fer ouer þe french flod felix brutus On mony bonkkes ful brode retayn he settez Wyth wynne Where werre and wrake and wonder Bi syþez hatz wont þerinne And oft boþe blysse and blunder Ful skete hatz skyfted synne