British spelling of eternalize; to make eternal, immortal, or lasting forever; to preserve something in memory permanently.
From 'eternal' (from Latin 'aeternalis') combined with '-ise' (British suffix for verbs). The word emerged in the 1500s as a way to express the act of making something immortal.
Shakespeare believed poetry could eternalise beauty and love—he literally wrote sonnets saying that by putting someone in verse, he'd make them live forever in readers' minds!
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