(physics) all the lines in the emission or absorption spectrum of hydrogen; each one corresponding to an allowed transition between quantum energy levels

plural of spectator

(physics) The distribution of the intensity of particles or radiation emitted in a nuclear process as a function of energy - a unique signature of each process.

(astronomy) an indication of the physical and chemical characteristics of a star based on the spectrum of light that it emits

having a wide scope or range of activity

A form of electromagnetic communication in which the signal frequency or bandwidth is spread beyond that required, rendering it more difficult to intercept or jam, or to send multiple signals over the same band

(medicine) Any disorder characterised by symptoms associated with autism.

plural of broad-spectrum antibiotic

plural of spectrum

In a spectacular manner, extraordinarily, amazingly.