Definitions by KoisterKloitch

bordism 

A bordism is an equivalence relalation between maninfolds. Two n dimensional manifolds are bordant if their is an n+1 dimensional manifold whose boundary is the disjoint union of the two n dimensional manifolds

A pair of pants is a bordism between the circle and the disjoint union of two circles.

bordism by KoisterKloitch June 21, 2012