Coalescence

Coalescence may refer to:

In genetics, the merging of lineages in backwards time. See coalescence (genetics).
In physics, engineering, meteorology and climatology, the process by which two or more droplets or particles merge during contact to form a single daughter droplet (or bubble). See coalescence (meteorology).
In linguistics, the process by which two or more words merge into a single one. See coalescence (linguistics)