What is the meaning of Loading?

The process by which something is loaded.

A load, especially in the engineering and electrical engineering senses of force exerted, or electrical current or power supplied.

An increased rate of pay given to an employee in order to compensate for specified non-standard working conditions, or a lack of specific other benefits. For example, an employee paid a casual loading is paid more than an equivalent full-time or part-time employee's rate, to compensate for a lack of benefits such as sick leave or annual leave.

A weighting or bias.

present participle and gerund of load

Source: wiktionary.org