(Science: radiobiology) The length of a single cycle of a wave, usually measured from crest-to-crest. For electromagnetic waves, the wavelength determines the type (radio, infrared, visible, ultraviolet, x-Ray, gamma-ray) of radiation, in the case of visible light, wavelength determines the colour of the light.
Synonyms for Lax: chaotic (adjective) amorphous, anarchical, anarchistic, blurry, chaotic, cluttered, confused, deformed,
late 14c., to make (something) less compact or dense, from Old French relaschier set free; soften; reduce (14c.), from Latin relaxare relax, loosen, open, stretch out, widen again; make loose, from re-back (see re-) + laxare loosen, from laxus loose (see lax). Of persons, to become less formal, from 1837. Meaning decrease tension is from early 15c.; intransitive sense of to become less tense is recorded from 1935. Related: Relaxed; relaxing.