An occupational therapist works with a client to help them achieve a fulfilled and satisfied state in life through the use of purposeful activity or interventions designed to achieve functional outcomes which promote health, prevent injury or disability and which develop, improve, sustain or restore the highest possible level of independence..
Wiktionary (0.00 / 0 votes) Rate this definition: functionality (Noun) The ability to perform a task or function; that set of functions that something is able or equipped to perform. functionality (Noun)
A technical definition of a function is: a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output.his means that if the object $x$ is in the set of inputs (called the domain) then a function $f$ will map the object $x$ to exactly one object $f(x)$ in the set of possible outputs (called the codomain).