The 27-year-old singer, whose last release was 2012's "Skyfall", surprised fans by teasing a new track, reported Female First.
The advertisement contained just white text on a black background and Adele's voice could be heard singing the words.
"Hello, it's me. I was wondering if after all these years you'd like to meet to go over everything. They say that time's supposed to heal you, but I ain't done much healing."
No further information was given.
Adele's last album was the 2011 record "21".