noun
assembly; aggregation; collective body
Refers to a group of things or people gathered together into a single entity, often used in technical or abstract contexts.
細胞の集合体が組織を形成する。
An aggregation of cells forms a tissue.
この会社は様々
This company is an assembly of various specialists.
集合 is the act of gathering or a mathematical set; 集合体 is the resulting entity or body.
Compound of 集合 (gathering) and 体 (body). The exact historical derivation is uncertain, but the meaning is transparent from its components.