nine

1. Origins, structure, and basic meaning

• Structure: 九 has two strokes and represents the number nine.
• Basic usage: It uses the on readings きゅう and く, along with kun-based forms such as ここのつ in 九つ.

2. Common pitfalls and similar expressions

• Month and date readings
  • 九月 is くがつ, while 九日 is ここのか.
  • The く used in the month name is not carried over unchanged to the date.
• The ninth and nine days
  • 来月の九日 means the ninth of next month; 九日かかる means to take nine days.
  • Both use the reading ここのか; context distinguishes the date from the duration.
• Nine items
  • 九つ, read ここのつ, counts objects or items such as questions.
  • 九つの質問 means nine questions; its ending differs from the day expression 九日.