(physics) Any of several general rules concerning the transitions between the states of a quantum mechanical system; they derive from the symmetry properties of the states and of their interactions

A process in modelbuilding, in which bulky and/or repetitious elements of the prototype being modeled are omitted, in order to capture the important details in a smaller-than-scale model.

(evolutionary theory) A type of natural selection where members of the sexes acquire distinct forms either because the members of one sex choose mates with particular features or because in the competition for mates among the members of one sex only those with certain traits succeed.

(US, law) A pathogen or biological toxin which has been declared to have the potential to pose a severe threat to public health and safety.

plural of select agent

Selecting oneself for something. / Selecting something for oneself. / (countable) An item selected by oneself.

(clinical psychology, psychiatry) A severe form of social anxiety disorder characterized by a total inability to speak or communicate orally in certain social settings. The inability to speak is involuntary and persistent, and is not caused by a communication disorder, neurodevelopmental disorder, psychotic disorder, or intellectual disability.

Alternative spelling of nonselective

(biology) The characteristic of an organism that enables it to survive and reproduce better than other organisms in a population in a given environment; the basis for evolution by natural selection.

plural of self-selection