The term 'not in attendance' can be expressed in two words: 'ABSENT' and 'OUT'. The word 'ABSENT' is a six-letter word meaning not present or not attending, while the word 'OUT' is a three-letter word meaning not present or away. This phrase is commonly used to describe someone who is not present at an event or gathering, such as a meeting, class, or party. It can also be used to describe someone who is not available for work or other activities.