kumitaてるterukumiたてtateru
1.

To take individual components and systematically combine them in order to create a cohesive whole, such as building furniture or developing a theoretical framework.

2.

To piece together various elements, often involving careful planning and organization, to form a functional or structured item, like assembling a model or constructing an argument.

3.

To bring together different parts or materials in a sequential manner to form a unified entity, which could relate to both physical objects and abstract concepts.

Example:

昨日、アンプを組み立てた。