Interesting antedatings

Revision of the entries in the June 2004 OED Online update has revealed an earlier origin than previously known for many words, including:

• omnipotence (antedated to a1460 from 1566)
• one-legged (1636 from 1842)
• onrush (noun; a1784 from 1844)
• onshore (1567 from 1875)
• ooh (1602 from 1916)
• opacify (1877 from 1940)
• open-minded (1748 from 1828)
• ophthalmic (a1425 from 1605)
• opportunistically (1915 from 1958)