To climb up onto something. She mounted the horse with ease.
To organize and initiate an event or campaign. They mounted a campaign to raise awareness about climate change.
To increase or grow in intensity. Tensions began to mount as the deadline approached.
To fix or place something securely in position. He mounted the painting on the wall.
(computing) To make a storage device or file system accessible to the operating system. You need root privileges to mount the external hard drive.