Translation guide
The act of putting parts together to form a whole, or gathering people/things in one place.
To express the action of joining components to build something, like furniture, machines, or models.
The most common verb for assembling physical objects from parts. Transitive.
I assemble a desk.
Noun form meaning 'assembly' or 'construction'. Often used in compound nouns.
This furniture is easy to assemble.
To assemble parts onto something, often used in manufacturing or mechanical contexts. Transitive.
Assemble parts onto the engine.
To express bringing people together in one place, often for a meeting or event.
Transitive verb meaning 'to gather' or 'to collect' people or things. The most natural choice for assembling a group.
Assemble the employees for a meeting.
To cause people to assemble, more formal. Often used in instructions or official contexts.
To convene or summon people for a formal meeting, like a committee or parliament.
Convene a committee.
To express collecting or bringing together information, data, evidence, etc.
To express people or things gathering by themselves, without a direct agent.
集める is transitive (to gather something/someone), while 集まる is intransitive (to gather by itself). Use 集める when you are assembling things, and 集まる when they assemble on their own.
The loanword アセンブルする exists but is mainly used in computing (e.g., assembly language) or very technical manufacturing. For everyday assembling of furniture or gathering people, use native Japanese verbs like 組み立てる or 集める.
Please assemble the students in the gymnasium.
Participants, please assemble at 9 a.m.