1. putting together the parts or pieces of something
Usage: present participle of assemble
2. gathering together in one place
Usage: present participle of assemble

1. the process of putting parts together or gathering people
Usage: gerund form

Examples

• The workers are assembling the new furniture in the warehouse.
• She spent hours assembling the puzzle with her children.
• The protesters are assembling in the town square.
• Students are assembling in the auditorium for the presentation.
• The assembling of the engine requires special tools.
• The assembling process took longer than expected.
• They are assembling evidence for the court case.