cloud

1. (obsolete) A rock; boulder; a hill.obsolete

2. (figurative) Anything unsubstantial.figuratively

3. (telecommunications) A telecom network (from their representation in engineering drawings).

4. (cloud computing, with "the") The Internet, regarded as an abstract amorphous omnipresent space for processing and storage, the focus of cloud computing.Examples: "Now we are liberal with our innermost secrets, spraying them into the public ether with a generosity our forebears could not have imagined. Where we once sent love letters in a sealed envelope, or stuck photographs of our children in a family album, now such private material is despatched to servers and clouds operated by people we don't know and will never meet."; "[…]the cloud could do this, it could do that. The cloud could be powerful and intelligent. It became a business buzzword and a selling point."; "“But there’s no fucking cloud,” says Crabapple, “there’s other people’s computers. There are vast datacentres that are sucking up water and electricity and rare-earth metals, literally boiling up the planet […]”"with-definite-article

5. (figuratively) A negative or foreboding aspect of something positive: see every cloud has a silver lining or every silver lining has a cloud.Examples: "But when he found that some of his interrogatories were evaded, and others answered undecisively, the look of gentleness which he had assumed, vanished, and his brow wore the cloud of disappointment and of anger."; "The only cloud on their night was that injury to Rafael, who was followed off the pitch by his anxious brother Fabio as he was stretchered away down the tunnel."figuratively

6. (slang) Crystal methamphetamine.slang