Non-appearance is a word used to describe the failure to show up or attend a specific event or meeting. It is often associated with absenteeism, neglect, or tardiness. However, the antonyms for non-appearance are presence, attendance, participation, and punctuality. Presence refers to being physically present at a specific location or event, while attendance is the act of showing up or participating in a scheduled event. Participation involves actively engaging in the activities or discussions of the event, while punctuality refers to being on time and not arriving late. These antonyms reflect the importance of being responsible, reliable, and committed to fulfilling obligations and duties.