Etymology
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application (n.)

early 15c., "the bringing of something to bear on something else," from Old French aplicacion (14c.), from Latin applicationem (nominative applicatio) "a joining to, an attaching oneself to; relation of a client to a patron," noun of action from past-participle stem of applicare "attach to, join, connect," from ad "to" (see ad-) + plicare "to fold" (from PIE root *plek- "to plait").

The meaning "sincere hard effort" is from c. 1600. That of "a formal request to be hired for a job or paid position" is by 1851. The computer sense "program designed to carry out specific tasks or solve specific problems within a larger system" is a shortening of application program (1969).

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app (n.)

computerese shorthand for application, attested by 1992.

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applet (n.)

by 1995, a diminutive formation from application + -let.

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misapplication (n.)

"a wrong or false application," c. 1600; see mis- (1) "bad, wrong" + application.

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*plek- 

Proto-Indo-European root meaning "to plait." It is an extended form of root *pel- (2) "to fold."

It forms all or part of: accomplice; application; apply; complex; complexion; complicate; complication; complicity; deploy; display; duplex; duplicate; duplicity; employ; explicate; explicit; exploit; flax; implex; implicate; implication; implicit; imply; multiply; perplex; perplexity; plait; plash (v.2) "to interlace;" pleat; -plex; plexus; pliable; pliant; plie; plight (n.1) "condition or state;" ply (v.1) "work with, use;" ply (v.2) "to bend; ply (n.) "a layer, fold;" replica; replicate; replication; reply; simplex; splay; triplicate.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit prasna- "turban;" Greek plekein "to plait, braid, wind, twine," plektos "twisted;" Latin plicare "to lay, fold, twist," plectere (past participle plexus) "to plait, braid, intertwine;" Old Church Slavonic plesti "to braid, plait, twist," Russian plesti; Gothic flahta "braid;" Old Norse fletta, Old High German flehtan "to plait;" Old English fleax "cloth made with flax, linen."

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sedulity (n.)

"diligent and assiduous application, constant attention," 1540s, from Latin sedulitas "assiduity, application," noun of quality from sedulus "attentive, diligent, busy" (see sedulous).

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misappropriation (n.)

"application to a wrong use," 1746; from mis- (1) "bad, wrong" + appropriation.

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astrophotography (n.)

"application of photography to the stars, sun, planets, etc.," 1858, from astro- + photography.

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biometrics (n.)

"application of statistics and mathematics to the study of biology," 1902, from biometry (also see -ics).

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misapply (v.)

"make an erroneous application of," 1570s, from mis- (1) "bad, wrong" + apply. Related: Misapplied; misapplying.

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