noun

• The water supply system of a district, town, city, or other place, including reservoirs, pipes, and pumps.
• (treated as singular) Any single facility, such as a filtration plant or pumping station, within such a system.
• (figuratively)
• (informal) Often in the form turn on the waterworks: crying or tears, especially in a way that is considered manipulative or over-emotional.
• (informal) Rain.
• (Britain, euphemistic) The genitourinary system.
• (historical, treated as singular) A hydraulic apparatus by which a supply of water is furnished for ornamental purposes; also, an ornamental fountain or waterfall.
• (construction, archaic) Engineering works relating to the conveyance and flow of fluids (principally water), such as the collection and distribution of water, drainage, irrigation, etc.