Examples include anon (at once; instantly), twixt (between), and swith (instantly; quickly).
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The modern English word for "thee" is you. Thee and thou are used the same way as our modern you and your.
Yule (archaic term for Christmas).
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antiquated "ar·cha·ic (är-kk) also ar·cha·i·cal (--kl) adj. 1. also Archaic Of, relating to, or characteristic of a much earlier, often more primitive period, especially one that develops into a classical stage of civilization: an archaic bronze statuette; Archaic Greece. 2. No longer current or applicable; antiquated: archaic laws. See Synonyms at old. 3. Of, relating to, or characteristic of words and language that were once in regular use but are now relatively rare and suggestive of an earlier style or period." http://www.thefreedictionary.com/archaic
The adjective is quadrennial. (extension of 1-annual, 2-biennial, 3-triennial) (The archaic word for a five-year period is a lustrum.)