Kia Orana and Welcome to our website! The Cook Islands Meteorological Service is a division of the Ministry of Transport. It is dedicated in providing you with the latest weather updates, forecasts and warnings for the Cook Islands. Since that first rainfall observation in 1899 in Rarotonga, more observations are now made so as to guide us to see what will happen tomorrow.
Definition of disallow. 1  transitive verb. 2  1 : to deny the force, truth, or validity of. 3  2 : to refuse to allow.
Freebase(0.00 / 0 votes)Rate this definition: Dispersion. In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency, or alternatively when the group velocity depends on the frequency. Media having such a property are termed dispersive media.