■ verb 'kju:mjʊleɪt
1》 ac~ or be ac~d.
2》 [as adjective ~d ] Chemistry denoting two double bonds attached to the same carbon atom.
■ noun 'kju:mjʊlət Geology an igneous rock formed by gravitational settling of particles in a magma.
Derivatives
cumulation noun
Origin
C16 (in the sense 'gather in a heap'): from L. cumulat- cumulare , from cumulus 'a heap'.