From WordNet (r) 3.0 (2006) :
functionality
n 1: capable of serving a purpose well; "software with greater
functionality"
From The Free On-line Dictionary of Computing (30 December 2018) :
functionality
Waffle for "{features " or "function". The
capabilities or behaviours of a program, part of a program, or
system, seen as the sum of its features. Roughly, "the
things it can do". Generally used in a comparative sense,
e.g. "The latest update adds some useful functionality".
(1997-07-14)