mieddae : noon (midday)
The Illunse word for noon (midday) is mieddae (if hyphenated, like mid-day, it's mied-dae). The Illunse word for day is dae.
This word is a mixture of the Old English word middæg (midday, noon), and the Latin word meridies (noon; midday) or meridianus (of midday, noon).
I couldn't find words for noon in Tolkien's languages of Quenya or Sindarin.