Bordism
A relation between Compact boundaryless Manifolds (also called closedManifolds). Two closed Manifolds are bordant Iff their disjoint union is theboundary of a compact 
-Manifold. Roughly, two Manifolds are bordant if together theyform the boundary of a Manifold. The word bordism is now used in place of the original term Cobordism.
References
Budney, R. ``The Bordism Project.'' http://math.cornell.edu/~rybu/bordism/bordism.html.
- Quadrable
- Quadrangle
- Quadrant
- Quadratfrei
- Quadratic Congruence
- Quadratic Curve
- Quadratic Effect
- Quadratic Equation
- Quadratic Field
- Quadratic Form
- Quadratic Formula
- Quadratic Integral
- Quadratic Invariant
- Quadratic Irrational Number
- Quadratic Map
- Quadratic Mean
- Quadratic Reciprocity Law
- Quadratic Reciprocity Relations
- Quadratic Reciprocity Theorem
- Quadratic Recurrence
- Quadratic Residue
- Quadratic Sieve Factorization Method
- Quadratic Surd
- Quadratic Surface
- Quadratrix of Hippias