got‧ten /ˈɡɒtn $ ˈɡɑːtn/
American English the past participle of get
⇒ ill-gotten gains


GRAMMAR
In American English, gotten is the usual past participle of get:
I’d gotten an A on the test.
I heard they had gotten divorced.
► In the phrase have got to, meaning 'must', gotten is never used instead of got:
The deaths have got to stop.
In British English, gotten is not used. The past participle of get in British English is got:
I had got a letter from my sister in Australia.

[TahlilGaran] Dictionary of Contemporary English ▲