(chemistry) A transitional structure, in an energetically excited state, that forms between the reactants of a chemical reaction and breaks down to form the products

(organic chemistry) Any of a wide range of techniques, often using catalysts, in which a carbon to hydrogen covalent bond of an organic compound is made to cleave in order to replace the hydrogen with a functional group.

Alternative form of reactivate

plural of ultrahazardous activity

(military) A state in which person in the military performs military duties on a full-time basis, as opposed to reserve, where one only occasionally performs military duties.

The process of attending carefully to what a speaker is saying, involving such techniques as accurately paraphrasing the speaker's remarks.

The real component of the power of an alternating current circuit; the product of the voltage and that part of the current that is in phase with the voltage

A geologic fault which has exhibited seismic activity within a geologically recent time period.

That responds to spoken commands.

plural of CH activation