A half marathon is a road running event of 13.1 miles (21.0975km, 193 yd). It is half the distance of a marathon and usually run on roads. It is a popular race for relative amateurs, long enough to be a serious challenge but not requiring the level of training of a full marathon.
i wanted to do a long run, but not as long as a marathon, so i ran a 13.1 and came in 2nd place.
by Fritos November 20, 2006

20 Words Related to 131

the most badass genre of music; a popular known indie-like music.
Wow, this music sounds similar to indie music, but better.. must be "131"
Ha yeah, lets burn some green.
by K1232xX June 19, 2011
The date Boston authorities crapped their pants over a viral marketing campaign and people stood up and said,"You frickin morons...STFU"
We live in a Post-131 world. Now, can I PLEASE bring my bottle of Jack Daniels on the plane?
by molochi February 01, 2007

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