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An object which can be constructed by squaring is called squarable.

The unit of solid angle. The solid angle corresponding to all of space being subtended is 4pi steradians.

A tangent point of two similar curves.

A quantity which transforms like a tensor except for a scalar factor of a Jacobian.

The tensor defined by T^l_(jk)=-(Gamma^l_(jk)-Gamma^l_(kj)), where Gamma^l_(jk) are Christoffel symbols of the first kind.

A curve which intersects some straight line in an infinity of points (but for which not every point lies on this curve).

A transformation of period 2.

A transformation of the form A^'=UAU^(H), where U^(H) denotes the conjugate transpose.

A homogeneous ideal defining a projective algebraic variety is unmixed if it has no embedded prime divisors.

A surface represented parametrically by elliptic functions.