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1.
A knight in King Arthur's court, who plays a significant role in much mediaeval literature - most notably in the anonymous Arthurian romance "Sir Gawayn and þe Grene Kni3t" (Sir Gawain and the Green Knight).
Gawan, þat sate bi þe quene,
To þe kyng he can enclyne:
"I beseche now with sa3ez sene
Þis melly mot be myne."

--Sir Gawain and the Green Knight, lines 339-342.
by Dr Apple January 06, 2005
 
2.
A top geezer, nice bloke, one to be trusted.
See that bloke who just done you a great deal on your motor? He is a real gawain.
by Peter Mallows October 11, 2003
 
3.
(noun)A knight of high honor and stature; (adj)To be able to fight honorably and respectfully; (verb)To fight honorably and respectfully while using intelligence at the same time.
(1)Matt: Nice one Adriel!
Adriel: Yay! I'm finally in a definition!
Matt: You fought him with honor and respect, and still came out victorious.
Joe: That is why he is Gawain...
by Nicholas D. Wolfwood April 25, 2004