The Grammy-winning singer will release 21 - the follow-up to her 2008 debut 19 - on January 24.
"It's different from 19 - it's about the same things but in a different light," she explained in a press release. "I deal with things differently now. I'm more patient, more honest, more forgiving and more aware of my own flaws, habits and principles - something that comes with age I think.
"So fittingly this record is called 21. The whole reason I called my first album 19 was about cataloging what happened to me then and who I was then - like a photo album you see the progression and changes in a person throughout the years."
The album was largely produced by Red Hot Chilli Peppers collaborator Rick Rubin in Malibu, California and Florence and the Machine cohort Paul Epworth in Kensal Rise, London.
It will be preceded by the single 'Rolling In The Deep' - described by Adele as a "dark bluesy gospel disco tune" and co-written by the singer with Epworth - on January 16.
The 21 cover art appears below:
Adele - full name Adele Laurie Blue Adkins - released her debut album 19 in January 2008. It went on to sell two million copies worldwide, spawning the UK top 20 hits 'Chasing Pavements', 'Cold Shoulder', 'Hometown Glory' and 'Make You Feel My Love', which has recently returned to the charts after becoming a popular X Factor audition song.
She collected Grammy Awards for Best New Artist and Best Female Pop Vocal Performance in 2009.