1. Load refers to beginning or executing a program by moving (loading) the necessary information from a diskette drive, such as a hard drive, into a computer's memory. Depending how much information needs to be loaded, how fast the hardware is, and how other programs are running determines the load time. If a program or command gives you a load average, the average is on average how long it takes ot load or execute a process.
2. When referring to electronics, a load is any circuit or device opposing electrical current.