Origin: Latin suffix -al
Functional has 8 different meanings across 1 category:
A function that takes a function as its argument; More precisely: A function y=f(x) whose argument x varies in a space of (real or complex valued) functions and whose value belongs to a monodimensional space. An example is the definite integration of integrable real functions in a real interval.
"The mathematician spent hours deriving the functional that maps every continuous curve on the graph to its exact area under the line."
In plain English: A functional person is someone who can do their daily tasks and get along with others without major problems.
"The server room houses several functional units that keep the data center running smoothly."
Usage: In everyday usage, "functional" is not used as a noun to describe mathematical operations on functions. Instead, it serves as an adjective meaning something that works for its intended purpose or performs its specific role effectively.
designed for or capable of a particular function or use
"a style of writing in which every word is functional"
"functional architecture"
relating to or based on function especially as opposed to structure
"the problem now is not a constitutional one; it is a functional one"
"delegates elected on a functional rather than a geographical basis"
fit or ready for use or service
"the toaster was still functional even after being dropped"
"the lawnmower is a bit rusty but still usable"
"an operational aircraft"
"the dishwasher is now in working order"
designed for or adapted to a function or use
"functional education selects knowledge that is concrete and usable rather than abstract and theoretical"
"functional architecture"
(of e.g. a machine) performing or capable of performing
"in running (or working) order"
"a functional set of brakes"
In good working order.
"After I replaced the broken battery, my watch was functional again and kept perfect time throughout the day."
In plain English: Functional means something works properly and is able to do what it is supposed to do.
"The old car is still functional despite its age."
Usage: Use functional to describe something that works properly despite potential flaws in appearance or design. Avoid using it when you simply mean an object is new or aesthetically pleasing.
The word functional comes from combining the root function with the suffix -al. It entered English to describe something that serves its intended purpose or operates effectively.