A quick definition of accommodation note:

An accommodation note is a written promise to pay money to someone else. It's like a special kind of note where someone else has signed it to help out the person who owes the money. There are many different types of notes, like ones that have to be paid all at once or ones that have small payments over time. Some notes are backed up by things like property or stocks, while others are not. Sometimes, people write notes to remember things later, like a to-do list.