Longman Dictionary of Contemporary English - gotten

~ AmE the past participle of get  (You've gotten us into a lot of trouble.)  (- see also ill­gotten)  ( USAGE NOTE: GOTTEN GRAMMAR In British English, got is the past participle of get, but in American English, gotten is more commonly used as the past participle Kim's gotten engaged! | He'd gotten up early that day. Got is used in British English to mean 'possess' We've got two cars. It may also be used this way in American English, though Americans usually use `have' We have two cars. Got is also used in British English to mean `buy' or `receive' Tim has just got a new bicycle. In American English, you can say either Tim has just gotten a new bicycle or Tim just got a new bicycle. Got is used in both British and American English to mean `must' I've got to talk to him. In American English, if you say I've gotten to talk to him, you mean you have succeeded in talking to him, but in both British and American English you would usually say I got to talk him. Gotten is not used in British English. )