1. to set up or put in place (equipment, software, or a system) for use
Usage: Also spelled 'install' (more common in U.S. English); 'instal' is the British variant
2. to place (a person) in an office or position, especially with a formal ceremony

Examples

• We need to instal a new air conditioning unit in the office.
• The technician will instal the software on your computer tomorrow.
• The university will instal the new president at a ceremony next month.
• They decided to instal solar panels on the roof.
• You can instal the app directly from the app store.
• The company instals security systems in homes and businesses.