Made something light, airy, or heavenly in quality; removed earthly or material qualities from something.
From ethereal (from Latin aether meaning 'upper air') plus the suffix -ise (British spelling of -ize), creating a verb meaning to make ethereal. The past tense form adds -ed.
This word shows how British English keeps the 's' spelling in -ise verbs, while American English switched to 'z' — it's a linguistic split that happened when American English reformed its spelling conventions in the 1800s.
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