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Origin and history of speed
speed(n.)
Middle English spede, from Old English sped "success, a successful course; prosperity, riches, wealth; luck, good fortune; opportunity, advancement," from Proto-Germanic *spodiz (source also of Old Saxon spod "success," Dutch spoed "haste, speed," Old High German spuot "success," Old Saxon spodian "to cause to succeed," Middle Dutch spoeden, Old High German spuoten "to haste").
This is reconstructed to be from PIE *spo-ti-, from root *spes- or *speh- "prosperity" (source also of Hittite išpai- "get full, be satiated;" Sanskrit sphira "fat," sphayate "increases;" Latin spes "hope," sperare "to hope;" Old Church Slavonic spechu "endeavor," spĕti "to succeed," Russian spet' "to ripen;" Lithuanian spėju, spėti "to have leisure;" Old English spōwan "to prosper").
The meaning "rapidity of movement, quickness, swiftness" emerged in late Old English (at first usually adverbially, in dative plural, as in spedum feran). The meaning "rate of motion or progress" (whether fast or slow) is from mid-14c. The sense of "gear of a machine" is attested from 1866. Slang use in reference to methamphetamine or a related drug is attested by 1967, from its effect on users.
Speed limit "maximum speed" of a vehicle (originally a locomotive), limited either by law or capability, is from 1879; the police officer's speed-trap is from 1908 (trap (n.1) in the police sense is by 1906). Speed bump as a traffic control device is by 1975; the figurative use is by 1990s. Full speed "highest rate of speed" is recorded from late 14c. Speed reading first attested 1965. Speedball "mix of cocaine and morphine or heroin" is recorded from 1909.
speed(v.)
Middle English speden, "achieve one's goal, accomplish one's purpose, get on successfully," from Old English spedan (intransitive) "to succeed, prosper, grow rich, advance," from the source of speed (n.). Compare Old Saxon spodian, Middle Dutch spoeden "hasten," Old High German spuoton "to succeed, prosper," German sputen "make haste, hurry."
The intransitive meaning "go hastily from place to place, get on rapidly" is attested from c. 1200. The transitive meaning "cause to advance toward success" is from mid-13c.; that of "send forth with quickness, give a high speed to" is from 1560s. The meaning "increase the work rate of" (usually with up) is from 1856. The meaning "drive an automobile too fast" is from 1908. Related: Speeded; sped; speeding.
The older sense is that in archaic salutations such as God speed you, wishing one prosperity, "may God give you advancement or success" (see godspeed).
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