The verb coalesce means to combine two or more things to form a bigger group or system.
Synonyms are fuse, blend, unite, or mix.
The word origins from Latin (1540s) coalescere meaning “unite, grow together, become one in growth”. It is derived from assimilated form of com– meaning “together” plus alescere meaning “be nourished”.
The bandit units coalesced into one army to fight the government.
The cells coalesced into a tissue.
The people’s decision has coalesced into a single output.