Maintenance n. : The act of maintaining; sustenance; support; defense; vindication.

Maintenance n. : That which maintains or supports; means of sustenance; supply of necessaries and conveniences.

Maintenance n. : An officious or unlawful intermeddling in a cause depending between others, by assisting either party with money or means to carry it on. See Champerty.

Example:
What kind of Maintenance does a belt drive require?

Taxonomy
product, MRO, Maintenance, repair and operations, free encyclopedia, tasks, final product, Product lifecycle management, engineering, MRO software, routine, MRO operations, service, plant, supply chain, asset, serviceability, inspection, Industrial supply companies.

Defination from the web:
Maintenance, repair and operations is fixing any sort of mechanical or electrical device should it become out of order or broken (known as repair, ... Many of these tasks are addressed in Computerized Maintenance Management Systems (CMMS) ... European Federation of National Maintenance Societies ...