1. the act or process of gathering or collecting a large quantity of something
2. a large quantity or collection of things that have been gathered together

Examples

• The amassment of wealth took him decades of careful investing.
• Her amassment of rare books filled three entire rooms.
• The amassment of evidence against the suspect was overwhelming.
• The museum’s amassment of ancient artifacts is impressive.
• The amassment of snow on the roof caused structural concerns.
• His amassment of knowledge on the subject made him an expert.