A cloud is an accumulation of water vapour in the sky.

Clouds are accumulations of water vapor.

A lot has changed in the past three hundred years. People are no longer obsessed with the accumulation of things. We've eliminated hunger, want, the need for possessions. We've grown out of our infancy.

As the love of money has been, in all ages, one of the passions that have given great disturbance to the tranquillity of the world, there is no topic more copiously treated by the ancient moralists than the folly of devoting the heart to the accumulation of riches.

Freckles are caused by the accumulation of melanocytes in a small area.

Her only interest is the accumulation of money.

In societies dominated by modern conditions of production, life is presented as an immense accumulation of spectacles. Everything that was directly lived has receded into a representation.