high noon

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. Exactly noon.
• n. The highest or most advanced stage or period: the high noon of her creativity.

from Wiktionary, Creative Commons Attribution/Share-Alike License

• n. Exactly noon; midday; the middle of the day.
• n. The zenith or apex of one's life or of a certain activity or plot.

from the GNU version of the Collaborative International Dictionary of English

• adj. the time when the sun is in the meridian.
• n. the exact meridian; midday.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• n. the middle of the day