1) Accrete 2) Admix 3) Clot 4) Coagulate 5) Concrete 6) Conflate 7) Flux 8) Fuse 9) Gel 10) Harden 11) Immix 12) Merge 13) Syncretise 14) Syncretize 15) Unite 1) Blend 2) Change integrity 3) Combine 4) Come together 5) Commingle 6) Conflate 7) Flux 8) Fuse 9) Fuse, combine 10) Grow together 11) Immix 12) Meld 13) Merge 14) Merge and mingle 
To merge or grow together into a similar but larger structure. 
• (n.) To grow together; to unite by growth into one body; as, the parts separated by a wound coalesce. • (n.) To unite in one body or product; to combine into one body or community; as, vapors coalesce.
Co`a·lesce' intransitive verb [ imperfect & past participle Coalesced ; present participle & verbal noun Coalescing .] [ Latin coalescere , coalitium ; co- + alescere to grow up, incho. from alere to...
[v] - fuse or cause to grow together
coalesce, coalesced 1. To merge or cause things to merge into a single body or group; to fuse. 2. To come together so as to form one whole; unite: 'The rebel units coalesced into one army to fight the invaders.'
To combine into one body or to grow together.
verb fuse or cause to grow together
[PSAT glossary] fuse or cause to come together[SAT terms] fuse or cause to come together