正午|しょうごshougo[1]atamadaka (head-high)

1. noun, adverbnoon; midday
   私わたしたちは、普通ふつう正午しょうごに昼食ちゅうしょくを食たべます。↗

   We usually have lunch at noon.

• Synonym真昼まひるNeutralMidday or broad daylight, as in 「真昼の太陽」; carries a literary flavor, while 「正午」 is the exact hour of twelve.
• Synonymお昼おひるCasualColloquial: midday or lunch, as in 「お昼にしよう」; the time is loose, not exactly twelve.
• Synonym昼ひるNeutralCovers daytime, midday or lunch, with a broad time range; 「正午」 refers strictly to twelve o'clock sharp.
• Synonym昼なかNeutralMeans broad daylight but is rare in everyday speech; 「昼間」 or 「真昼」 is what people usually say.
• Antonym真夜中まよなかNeutralThe dead of night; the opposite pole to the midday point that 「正午」 marks.
• Antonym深夜しんやNeutralLate at night; contrasts with 「正午」 as night against day.

Use 「正午」 for exactly twelve o'clock. For midday in everyday talk say 「昼」 or 「お昼」; for broad daylight, 「真昼」. 「真夜中」 and 「深夜」 are the night-time opposites.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 昼ひるの十二じゅうに時じ（0時じ）。午うまの刻ときの中間ちゅうかん。