many

1. Origins, structure, and basic meaning

• Structure: 多 means many; its kun-reading is おおい and its on-reading is た.
• Basic usage: 多い(おおい) expresses a large number, while 多分(たぶん) means probably.

2. Common pitfalls and similar expressions

• Quantity and probability
  • 人が多い means there are many people. 多分 instead expresses the likelihood of a statement, rather than a count of people or things.
  • 多分、彼はまだ駅に着いていない means that he probably has not reached the station yet.