Definition of sticky note in US English:

sticky note

noun

  • 1A small piece of (often yellow) notepaper with a lightly adhesive strip along one edge of the reverse side, enabling it to be stuck to a surface, and to be easily removed when necessary.

  • 2Computing a note or comment attached to selected content in an electronic document, typically appearing in a separate window or frame to that of the document itself; (in later use also) a small window that can be placed within another window or screen and used for leaving notes and comments, typically designed to resemble a sticky note and to remain in place even if the computer is restarted.

Origin

1970s; earliest use found in The Lima News.