1. the action of extending something or the condition of being extended
2. a part that is added to something to make it larger or longer
3. an additional period of time allowed for something

Examples

• The library is building extensions to accommodate more books.
• She asked for an extension on her homework assignment.
• Please call extension 245 to reach the marketing department.
• The house extensions added two bedrooms and a bathroom.
• Her hair extensions made her hair look much longer.
• The deadline extension gave students an extra week to finish.
• The cable extensions allowed us to reach the outlet across the room.