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1.
Zayn (pronounced ZANE) is the seventh letter of many Semitic abjads, including Phoenician, Aramaic, Hebrew Syriac, and Arabic alphabet. The letter is called zayn and is written is several ways depending in its position in the word.

Zayn is also a masculine Arabic name which means "Beauty and Grace." Zayn refers to inner beauty not external beauty. It can be the first name for a boy or a surname. It is a very common name among people of Middle Eastern and North African descent.
Hajji Zayn al-‘Attar, was a 14th century Persian physician.

Ali ibn Husayn the fourth Shi'a Imam (659-713 AD) was nick named "Zayn al-Abidin" (Beauty of the Worshippers).
by Yasmine Zayn December 20, 2007
 
2.
A teenage boy with dark skin, eyes hair. He walks around looking like a bad-boy. Cigarette in hand, hair messy, tattoos, five o'clock shadow. But, when you get to meet him, he's innocent. He's sexy & shy. You'll never meet a guy like him. He's original. When he talks, you melt. When he sings, you break. When he laughs, you feel warm. He showers you with "I love you's" & "You're beautiful's". Especially to the short, blonde & blue eyed girls. Usually reffering to you as babe. If you meet a Zayn, it's okay to be nervous. They find that attractive. Zayn's love long-distance girlriends. So, when he sees you it's that much more special. Most, Zayn's love to meet their soul-mates at unusal places. Like, concerts. If you're lucky enough to do so, make sure to give him a quick pop on the lips. You won't regret it. A zayn would usually like an out-going girl, but would love to settle down with someone just as shy as him.
You: *bumps into a Zayn*
You: "I'm so sorry."
Zayn: "Well, that's quite alright, babe." "I love your eyes by the way."
by anonymous_13 December 30, 2012
 
3.
Gender: Masculine

Its meaning takes on several forms but most often linked to beauty, grace or some fu*king G who jacks loads of gash because he is superiorly buff and makes all the girls collapse because of his huge trouser snake
What a lucky dude, check out all those girls at his feet. He is some regular ZAYN.
by Hafsa K November 30, 2006
 
4.
(adjective) to stink so bad it was thought impossible
"You Zayn so bad i want to kill myself!"
by hansdirkpromeisterhappyman February 06, 2007
 
5.
A queer with no purpose in life. Steps on anyone to get ahead. Has a serious lack of intellect with an extreme case of uncoordination. Usually has a large gut and slits for nipples. Can also be used as a synononym for idiot.
A fat kid trips and falls. "Oh man, what a Zayn!"
by Chelzea Clinton March 13, 2009