Treatment of seed at low temperature under moist conditions to break its dormancy is called:
Stratification
Stratification is a brief cold-treatment (few days) of water soaked seeds to break seed dormancy, resulting in an even germination.
Scarification involves weakening, opening, or otherwise altering the coat of a seed to encourage germination.
Vernalization and Chelation is the chill treatment of plant in its early stages of life history to stimulate or induce early flowering.