noun
Used for counting repetitions or frequency; common in set phrases like 百度参り (visiting a shrine a hundred times).
彼はその言葉を百度も繰り返した。
He repeated that phrase a hundred times.
noun
hundred degrees
Used for temperature, angles, or other degree measurements; context distinguishes from the 'times' sense.
水は百度で沸騰する。
Water boils at a hundred degrees.