Insulation

google

ref

mid 16th century (in insulate (sense 2)): from Latin insula ‘island’ + -ate3.

wiktionary

ref

insulate +‎  -ion

etymonline

ref

insulation (n.)

noun of action from insulate (v.) in its various senses. From 1767 as "a blocking from electricity or heat" (by interposition of a non-conductor). Sense of "state or action of being detached from others" is from 1798. Literal meaning "act of making (land) into an island" is from 1784; that of "state of being an island" is from 1799. The concrete sense of "insulating material" is recorded by 1870.