app
noun
\ ˈap
\
\
Definition of app
(Entry 1 of 2)
1
: application sense 3
a word processing app
especially
: an application designed for a mobile device (such as a smartphone)
Health-insurance companies and government officials alike are drawn to the ability of smartphone apps to reach tough-to-access patients, to effect long-term lifestyle changes, and to do it all at a very low cost. — Marcellus Hall
— see also killer app
2
informal
: appetizer
… the hidden video monitors that tell the cooks when the V.I.P.'s have finished their apps …— Thomas McNamee