Mount

Mount has three main meanings. 

 Mountain 

"Mount" is often used to mean "mountain", as part of a name e.g. Mount Vesuvius, Mount McKinley, Mount Everest. 

 Mount as a verb 
To "mount" something means to put it onto something else. 

 An artist mounts his paintings on cardboard. An architect mounts his models on foamcore. 
 A camera is mounted on a tripod. A gun is mounted on the deck of a ship.
 A rider mounts a horse. A gymnast mounts the balance beam for a display. 
 A male animal mounts a female animal to have sexual intercourse. 

 Mount as a noun 
A "mount" is a thing for mounting something on. 

It might be a piece of equipment such as: 
 A lens mount for a camera. This is the part of the camera that is made specially so that lenses can be attached. 

It might be a piece of stiff flat "backing" such as: 
 A mount for a stuffed animal. This is a piece of polished wood that a stuffed animal can be fixed to, for display. 
 A picture mount. This is a piece of cardboard which a photograph or other picture is attached to. 

It might be an animal: 
 "Frederick's mount was a fine black horse, Ernest's mount was a chestnut mare, Clumsy Jack's mount was a skinny old goat." 

 Mount in computing and software 
 Mount (in computing), the process of making a file system accessible
 Mount Unix, the utility in Unix-like operating systems which mounts file systems 
 Mount (streaming), a concept used in streaming software programs