a narrow walkway, especially one high above the surrounding area, used to provide access or allow workers to stand or move, as over the stage in a theater, outside the roadway of a bridge, along the top of a railroad car, etc.

1880–85; cat1 + walk Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
catwalk (ˈkætˌwɔːk)
1.  a narrow ramp extending from the stage into the audience in a theatre, nightclub, etc, esp as used by models in a fashion show
2.  a narrow pathway over the stage of a theatre, along a bridge, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1885, "long, narrow footway," from cat + walk; in ref. to such narrowness of passage one has to cross carefully, as a cat walks. Originally of ships and theatrical back-stages. Application to fashion show runways is mid-20c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The core is laid out in special holders on the core-receiving catwalk.
Fashion is highly perishable, quickly influenced by the latest thing seen on
  the catwalk or on the back of a celebrity.
Usually sidelined in the seats, this time celebrities strutted the catwalk
  wearing red dresses by various designers.
Watch these two models get into a fight while walking the catwalk at a live
  fashion show.
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