1. the act of extending or the state of being extended; an increase in length, duration, or scope
2. something that extends or is added to something else to make it larger or longer
3. an additional period of time granted to complete a task or deadline

Examples

• The teacher granted an extension on the essay deadline.
• They built an extension onto the back of their house.
• You can reach me at extension 245 from the main office number.
• The project required an extension of the original timeline.
• The university offers extension courses for working professionals.
• Hair extensions are used to add length and volume.
• The extension of the highway will reduce traffic congestion.