energy saving
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GC: n

CT: Energy saving is an important issue to both the environment and the economy. As most of us are using computers and their associated peripherals, such as monitors and printers, we can all contribute to saving energy by turning on their energy saving features. This will save a substantial amount of energy, particularly when the equipment is idle.

S: http://www.cuhk.edu.hk/itsc/about/energysave.html (last access: 30 December 2014)

N: 1. energy (n): 1590s, “force of expression,” from Middle French énergie (16c.), from Late Latin energia, from Greek energeia “activity, action, operation,” from energos “active, working,” from en “at” + ergon “work, that which is wrought; business; action”.
Used by Aristotle with a sense of “actuality, reality, existence” (opposed to “potential”) but this was misunderstood in Late Latin and afterward as “force of expression,” as the power which calls up realistic mental pictures. Broader meaning of “power” in English is first recorded 1660s. Scientific use is from 1807. Energy crisis first attested 1970.
savings (n): “money saved,” 1737, plural of saving, verbal noun from save (v.). Related: Savings account attested by 1882; savings bank, 1817. S & L for savings and loan attested from 1951.
2. Such measures may be passive (e.g. insulation); active (e.g. utilisation of waste heat or gas that would otherwise be flared); or organisational (e.g. change in modes of transport).

S: 1. OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=energy&searchmode=none; http://www.etymonline.com/index.php?allowed_in_frame=0&search=saving&searchmode=none (last access: 30 December 2014). 2. GDT (last access: 30 December 2014).

SYN: energy savings

S: GDT (last access: 30 December 2014); TERMIUM PLUS (last access: 30 December 2014); CR: energy