The word "multiyear" means something that occurs, lasts, or is planned for multiple years. Full definition
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These data were used to quantify changes in the ice cover's composition, revealing a substantial reduction of about 14 percent in the area of multiyear ice in winter during the period from 1978 to 1998. (science.sciencemag.org)
This probably reflects loss of multiyear ice in the Beaufort and Chukchi seas as well as other factors that are making the ice more vulnerable.» (earthtimes.org)
Overall, the Outlook yields mixed signals, with the potential for substantial sea ice loss due to what appears to be a record - low in multiyear sea ice extent compared to the extent of first year sea ice, tempered by cooler conditions less favorable to a massive ice loss than in the past two years. (searcharcticscience.org)