Meaning of “insulation” - Learner’s Dictionary

insulation

noun [ U ] uk us /ˌɪnsjəˈleɪʃən/
MATERIAL

a special material used for insulating something such as a wall, roof, or building

PROCESS/CONDITION

the process of insulating something, or being insulated

(Definition of “insulation” from the Cambridge Learner’s Dictionary © Cambridge University Press)