Highness
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Old English hēanes (see high, -ness).
wiktionary
From Middle English hyghnesse; equivalent to high + -ness.
etymonline
highness (n.)
Old English heanes; see high (adj.) + -ness. Meaning "royalty, excellence, nobility" is early 13c.; Your Highness as a form of address to English royalty is attested from c. 1400.
