Definition of seasonality in English English dictionary
Large variations in product demand that reoccur during the same approximate timeframe on a yearly basis and are not due to a trend or promotion (as in the yearly demand for Halloween candy or snow shovels) Products that exhibit a high degree of seasonality normally require an inventory build based on forecast prior to the high demand period, or the flexibility to greatly vary production and supply
Real or perceived changes in the market that are attributed to buyer habits and time of the year
The variation in sales for goods and services throughout the year, depending on the season, e g hot chocolate is advertised more in the winter, as opposed to summer months