(mathematics) a theorem providing conditions under which an operator or matrix can be diagonalized

plural of spectatress

(dated) A female spectator.

(physics) A spectrum, typically produced by a luminous gas, that consists of separate lines typical of particular elements

The range of conditions classified as pervasive developmental disorders, generally held to include autistic disorder, Asperger syndrome, and pervasive developmental disorder - not otherwise specified (PDD-NOS). Also includes childhood disintegrative disorder and Rett syndrome.

(slang) Extremely spectacular.

Vampyrum spectrum, the largest carnivorous bat.

Synonym of autism spectrum

plural of autistic spectrum disorder

plural of spectatorship