Etymology
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device (n.)

c. 1300, devis, "intent, desire; an expressed intent or desire; a plan or design; a literary composition," from Old French devis "division, separation; disposition, wish, desire; coat of arms, emblem; a bequest in a will, act of bequeathing," from deviser "arrange, plan, contrive," literally "dispose in portions," from Vulgar Latin *divisare, frequentative of Latin dividere "to divide" (see divide (v.)).

The basic sense is "method by which something is divided," which arose in Old French and led to the range of modern meanings via the notion of "something invented or fitted to a particular use or purpose," hence "an invention; a constructed tool; inventiveness; a contriving, a plan or scheme."

In English from c. 1400 as "artistic design, work of art; ornament," hence especially "a representation of some object or scene, accompanied by a motto or legend, used as an expression of the bearer's aspirations or principles." Also from c. 1400 as "mechanical contrivance," such as a large crossbow fitted with a crank. From mid-15c. as "a bequest in a will." Since c. 1996 the word has come to be used especially for "hand-held or mobile computing or electronic instrument."

We live in a kind of world and in an age of the world where devices of all sorts are growing in complexity, where, therefore, the necessity for alertness and self-mastery in the control of device is ever more urgent. If we are democrats we know that especial perils beset us, both because of the confusion of our aims and because it is easier for the mob than for the individual to mistake appetite for reason, and advantage for right. [Hartley Burr Alexander, "'Liberty and Democracy,' and Other Essays in War-Time," 1918]
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Brannock device (n.)

standard foot-measuring tool used for determining shoe size, patented 1926 and 1927 and named for its inventor Charles Brannock (1903-1992), son of the owner of a popular Syracuse, N.Y., shoe store.

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devise (v.)

early 13c., devisen, "to form, fashion;" c. 1300, "to plan, contrive, think or study out, elaborate in the mind," from Old French deviser "dispose in portions, arrange, plan, contrive" (in Modern French, "to chat, gossip"), from Vulgar Latin *divisare, frequentative of Latin dividere "to divide" (see divide (v.)).

Sense of "give, assign, or transmit by will" is from late 14c. in English, from Old French, via the notion of "to arrange a division." As a noun, "act of bequeathing by will" (1540s), also "a will or testament." Compare device. Related: Devised; devising.

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skyhook (n.)
also sky-hook, "imaginary device to hold things up," 1915, originally aviators' jargon, from sky (n.) + hook (n.). Applied from 1935 to actual device for lifting things into the air.
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beeper (n.)
"device that emits beeps," 1946, agent noun from beep (v.).
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sizer (n.)
"device for measuring sizes," 1670s, agent noun from size (v.).
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mine (n.2)

"explosive device," by 1866 in reference to submarine weapons (at first not distinguished from torpedoes), from mine (v.2). By 1890 as "land-mine, explosive device placed on the ground (or just under it) as a weapon."

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barbell (n.)
exercise device, 1870, from bar (n.1) + ending from dumbbell.
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timer (n.)
1908 as a mechanical device, agent noun from time (v.).
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photocopier (n.)

"device for making photocopies," 1934, agent noun from photocopy (v.).

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