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(1) (APPlication) The file extension for executable Mac applications. See APP file.

(2) (APPlication) The term has been shorthand for "application" in the IT community for a long time. However, it became popular with the consumer for mobile applications after Apple debuted the iPhone in 2008. Application and app are synonymous, and it is just as correct to say "iPhone application" as it is "desktop computer app." App is shorter, and computer people love to abbreviate (see TLA). See application and online app store.

(3) (APPlication) In the engineering world, an app can refer to a circuit design, using the word "application" in the context of purpose. For example, "high-voltage apps" means high-voltage circuit designs. The term predates mobile software apps by decades.

Apps Are Everywhere
After installing a new smart TV, as in this Samsung 4K TV example in 2016, users have the option of downloading apps from Netflix, Amazon and other content providers.

We Do Mean "Everywhere"
For decades the word "apps" has been shorthand for "appetizers" and still is.
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References in periodicals archive ?
In pN1, the benefits (score increment) also influence several areas in far-end areas and near border, as well as in pN2. In addition, in pN1, H and S have a good interaction inside the same block and linked strongly without separation.
PN1 (Being conventionally indirect) and PN2 are the most frequent.
Among 56 patients 13 (23.2 %) were pN0, 26 (46.4 %) were pN1, 9 (16.0%) were pN2, and 8 (14.2%) were pN3.
Mice pups delivered on postnatal day 1 (PN1) were randomly divided into four groups: the control group, receiving saline and room air exposure, the LPS group, receiving an intranasal dose (3 [micro]g/3 [micro]L) of LPS on alternate days (PN2, -4, and -6) in room air (RA), and the LPS and hyperoxia groups, receiving an intranasal LPS dose (PN2, -4 and -6) and 100% oxygen exposure from PN1-7.
A triple (X, v, T) is said to be a Menger probabilistic non-Archimedean normed space if (PN1) and (PN2) (in De_nition1.6) and
Os frangos que consumiram as racoes dentro dos planos PN3, PN4 e PN5 obtiveram ganho de peso superior ao das aves que receberam os planos nutricionais PN1 e PN2. Considerando que a lisina e o principal aminoacido utilizado para deposicao de carne, e que as linhagens de alto potencial genetico possuem maior sintese proteica devido a sua velocidade de crescimento, os maiores niveis de lisina digestivel, possivelmente, proporcionaram aumento na sintese proteica em relacao aos niveis mais baixos de lisina digestivel.
Second, cuneiform records tend to use what Gross calls a "transfer clause" ("PNI, for the full price, to PN2 sold X and transferred it") instead of an investiture clause.
This work was supported in part by POSDRU/89/1.5/S/62557 and by CNCSIS grant PN2 Resurse Umane/11 din 01.07.2009.
Las crias fueron reducidas a 4 machos y 4 hembras por madre en PN2. Ambos grupos se destetaron e individualizaron el dia PN18.