Safety

safety
1. The condition or state of being safe; freedom from danger or hazard; exemption from hurt, injury, or loss. Up led by thee, Into the heaven I have presumed, An earthly guest . . . With like safety guided down, return me to my native element. (milton)
2. Freedom from whatever exposes one to danger or from libility to cause danger or harm; safeness; hence, the quality of making safe or secure, or of giving confidence, justifying trust, insuring against harm or loss, etc. Would there were any safety in thy sex, That I might put a thousand sorrows off. (Beau. & Fl)
3. Preservation from escape; close custody. Imprison him, . . . Deliver him to safety; and return. (Shak)
4. Same as Safety touchdown, below.
(Science: chemistry) Safety arch, a tube to prevent explosion, or to control delivery of gases by an automatic valvular connection with the outer air; especially, a bent funnel tube with bulbs for adding those reagents which produce unpleasant fumes or violent effervescence. Safety valve, a valve which is held shut by a spring or weight and opens automatically to permit the escape of steam, or confined gas, water, etc, from a boiler, or other vessel, when
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the pressure becomes too great for safety; also, sometimes, a similar valve opening inward to admit air to a vessel in which the pressure is less than that of the atmosphere, to prevent collapse.
Origin: Cf. F. Sauvete.