Tan (noun)
A yellowish-brown colour.
"color panel|D2B48C"
Tan (noun)
A darkening of the skin resulting from exposure to sunlight or similar light sources.
"She still has a tan from her vacation in Mexico."
Tan (noun)
The bark of an oak or other tree from which tannic acid is obtained.
Tan (noun)
An Armenian drink made of yoghurt and water similar to airan and doogh
Tan (noun)
, particularly in Cantonese contexts.
Tan (noun)
A twig or small switch.
Tan (adjective)
Of a yellowish-brown.
"Mine is the white car parked next to the tan pickup truck."
Tan (adjective)
Having dark skin as a result of exposure to the sun.
"You’re looking very tan this week."
Tan (verb)
To change to a tan colour due to exposure to the sun.
"No matter how long I stay out in the sun, I never tan. though I do burn."
Tan (verb)
To change an animal hide into leather by soaking it in tannic acid. To work as a tanner.
Tan (verb)
To spank or beat.
Tan (numeral)
The second cardinal number two, formerly used in Celtic areas, especially Cumbria and parts of Yorkshire, for counting sheep, and stitches in knitting.

Tanned (adjective)
Having a suntan.
"You're looking very tanned."
"tanned bodies lying on the beach"
Tanned (adjective)
Finished, made using tannic acid (as opposed to abrasion).
Tanned (verb)
simple past tense and past participle of tan

Wiktionary

Tan (noun)
See Picul.
Tan (noun)
The bark of the oak, and some other trees, bruised and broken by a mill, for tanning hides; - so called both before and after it has been used. Called also tan bark.
Tan (noun)
A yellowish-brown color, like that of tan.
Tan (noun)
A brown color imparted to the skin by exposure to the sun; as, hands covered with tan.
Tan (adjective)
Of the color of tan; yellowish-brown.
Tan
To convert (the skin of an animal) into leather, as by usual process of steeping it in an infusion of oak or some other bark, whereby it is impregnated with tannin, or tannic acid (which exists in several species of bark), and is thus rendered firm, durable, and in some degree impervious to water.
Tan
To make brown; to imbrown, as by exposure to the rays of the sun; as, to tan the skin.
Tan
To thrash or beat; to flog; to switch; as, to tan a disobedient child's hide.
Tan (verb)
To get or become tanned.

Webster Dictionary

Tan (noun)
a browning of the skin resulting from exposure to the rays of the sun
Tan (noun)
a light brown
Tan (noun)
ratio of the opposite to the adjacent side of a right-angled triangle
Tan (verb)
treat skins and hides with tannic acid so as to convert them into leather
Tan (verb)
get a tan, from wind or sun
Tan (adjective)
of a light yellowish-brown color

Tanned (adjective)
(of skin) having a tan color from exposure to the sun;
"a young bronzed Apollo"
Tanned (adjective)
converted to leather by a tanning agent

Princeton's WordNet