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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 ?
This in itself does not establish any causality but does implicate further the role of these proteins in AD pathogenesis potentially by contributing in some fashion to the net beta-amyloid peptide accumulation in the CNS.
From those, they then physically created mutant beta-amyloid peptides using chemical synthesis.
Abnormal cleavage, or failure to dear beta-amyloid peptides, causes them to accumulate into oligomers (two to 12 peptide strands joined together), fibrils and plaques.
Two of the identified mutations are responsible for an under-expression of SORL1, resulting in an increase in the production of the beta-amyloid peptide.
Beta-amyloid peptide at sublethal concentrations downregulates brain-derived neurotrophic factor functions in cultured cortical neurons.
Beta-amyloid peptide is considered to be responsible for the formation of senile plaques that accumulate in the brains of patients with Alzheimer's disease.
In the second pathway, beta-secretase cleaves the APP molecule at one end of the beta-amyloid peptide, releasing a fragment called sAPP[beta] from the cell.
Truncated beta-amyloid peptide species in pre-clinical Alzheimer's disease as new targets for the vaccination approach.) Neurochem 2003;85:1581-91.
They found that the crucial enzyme, in addition to degrading insulin, does so to beta-amyloid peptides. Most importantly, even a partial decrease in insulysin activity was found to raise beta-amyloid peptide levels in the brain.
21, RC 120;2001:1-5), beta-amyloid peptide has long been thought to be responsible for the build-up of plaques in the brain that is endemic to Alzheimer's disease.
"Our experiments revealed that the plaque build-up can be eliminated by an amino acid, beta-amyloid peptide, or AN-72," he said.
One of these hypotheses is the "amyloid hypothesis," which supports the idea that beta-amyloid peptide (A[beta]) plays a very important role in the origin and progression of the nervous tissue damage seen in these patients [4].