Real Dictionary

cloud
countable noun: A cloud of something such as smoke or dust is a mass of it floating in the air.
singular noun: The cloud is the network of remote servers that is used in cloud computing.
variable noun: A cloud is a mass of water vapour that floats in the sky. Clouds are usually white or grey in colour.
verb: If you say that something clouds a situation, you mean that it makes it unpleasant.
verb: If you say that something clouds your view of a situation, you mean that it makes you unable to understand the situation or judge it properly.

cloud in American English
a visible mass of tiny, condensed water droplets or ice crystals suspended in the atmosphere: clouds are commonly classified in four groups: A (high clouds above 6,096 m or 20,000 ft) cirrus, cirrostratus, cirrocumulus; B (intermediate clouds, 1,981 m to
noun: a visible collection of particles of water or ice suspended in the air, usually at an elevation above the earth's surface

cloud in British English
noun: a mass of water or ice particles visible in the sky, usually white or grey, from which rain or snow falls when the particles coagulate