functional

1. Capable of performing; operative: a functional set of brakes.

2. Designed for or adapted to a particular function or use: functional architecture.

3. Of or relating to a function.

4. Of, relating to, or indicating a mathematical function or functions.

5. Pathology Involving functions rather than a physiological or structural cause.

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1. A linear function on vectors whose values are scalars.

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Here are some other words you could make with the letters functional, you can also
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Top Words by points	Points	Word Game
functional	15	Scrabble

2 Letters	Scrabble® Points
ai	2
al	2
an	2
at	2
fa	5
if	5
in	2
it	2
la	2
li	2
lo	2
na	2
no	2
nu	2
of	5
oi	2
on	2
ta	2
ti	2
to	2
un	2
ut	2

3 Letters	Scrabble® Points
act	5
aft	6
ail	3
ain	3
ait	3
alt	3
ani	3
ant	3
caf	8
can	5
cat	5
col	5
con	5
cot	5
cut	5
fan	6
fat	6
fil	6
fin	6
fit	6
flu	6
fon	6
fou	6
fun	6
inn	3
ion	3
lac	5
lat	3
lin	3
lit	3
lot	3
lun	3
nan	3
nil	3
nit	3
not	3
nun	3
nut	3
oaf	6
oat	3
oca	5
oft	6
oil	3
out	3
tan	3
tao	3
tau	3
tic	5
til	3
tin	3
ton	3
tui	3
tun	3
uni	3
uta	3

4 Letters	Scrabble® Points
alif	7
alit	4
alto	4
anil	4
anon	4
anti	4
aunt	4
auto	4
cain	6
calf	9
calo	6
cant	6
caul	6
ciao	6
cion	6
clan	6
clon	6
clot	6
coal	6
coat	6
coft	9
coif	9
coil	6
coin	6
cola	6
colt	6
coni	6
conn	6
cuif	9
cult	6
fact	9
fail	7
fain	7
fano	7
faun	7
fiat	7
fico	9
fila	7
filo	7
fino	7
flan	7
flat	7
flic	9
flit	7
floc	9
foal	7
foci	9
foil	7
foin	7
font	7
foul	7
fuci	9
icon	6
info	7
into	4
iota	4
laic	6
lain	4
lati	4
latu	4
lift	7
linn	4
lino	4
lint	4
lion	4
litu	4
loaf	7
loan	4
loca	6
loci	6
loft	7
loin	4
lota	4
loti	4
lout	4
luna	4
lunt	4
naif	7
nail	4
nano	4
naoi	4
noil	4
nona	4
noni	4
nota	4
noun	4
otic	6
taco	6
tail	4
tain	4
talc	6
tali	4
tian	4
tofu	7
toil	4
tola	4
tolu	4
tufa	7
tuna	4
ulan	4
ulna	4
unai	4
unci	6
unco	6
unit	4
unto	4

5 Letters	Scrabble® Points
actin	7
afoul	8
aloft	8
aloin	5
ancon	7
anion	5
annul	5
antic	7
aulic	7
calif	10
canon	7
canto	7
clift	10
clout	7
coati	7
colin	7
conin	7
cotan	7
count	7
culti	7
cunit	7
cutin	7
faint	8
fanon	8
fault	8
final	8
finca	10
flint	8
float	8
flota	8
flout	8
focal	10
folia	8
folic	10
fount	8
futon	8
linac	7
lotic	7
nicol	7
niton	5
notal	5
octal	7
octan	7
oculi	7
ontic	7
talon	5
tauon	5
tical	7
tolan	5
tonal	5
tonic	7
tunic	7
uncia	7
unfit	8
unica	7
union	5
unlit	5
until	5

6 Letters	Scrabble® Points
action	8
alnico	8
annuli	6
anoint	6
atonic	8
canful	11
cannot	8
canton	8
cation	8
catlin	8
citola	8
coital	8
coltan	8
confit	11
falcon	11
fanion	9
flacon	11
flaunt	9
fontal	9
incant	8
incult	8
infant	9
infula	9
latino	6
nation	6
nonfat	9
nounal	6
nuncio	8
oilcan	8
talion	6
tannic	8
tincal	8
tinful	9
toluic	8
toucan	8
tufoli	9
tunica	8
uncial	8
uncoil	8
unnail	6

7 Letters	Scrabble® Points
actinon	9
antiflu	10
antlion	7
auction	9
cannoli	9
caution	9
contain	9
faction	12
folacin	12
fontina	10
inocula	9
linocut	9
lunatic	9
nonfact	12
outlain	7
uncinal	9
unction	9

8 Letters	Scrabble® Points
clafouti	13
continua	10
countian	10
fountain	11
function	13
lunation	8

9 Letters	Scrabble® Points
continual	11
inoculant	11

10 Letters	Scrabble® Points
functional	15