(linear algebra) A square matrix A with complex entries that is equal to its own conjugate transpose, i.e., such that A=A^†.

plural of maternity ward

One who is the same age as another.

dry weight; a measurement of the mass of something when completely dried

(mathematics) A matrix whose entries are all zero.

(linear algebra) A matrix which when multiplied by its conjugate transpose yields the identity matrix.

(linear algebra) A square matrix which is not invertible.

(countable, idiomatic, vulgar, slang) A pointless competition, dispute or conflict, often over some trivial matter.

(philosophy, natural science) The stuff or matter of which something is made.

plural of symmetric matrix