A hundred-dollar bill, or any other note denominated 100 (e.g. a hundred euros).
"He pulled out a crisp hundred from his wallet to pay for the expensive meal."
In plain English: A hundred is a number that represents one group of one hundred items.
"She saved up enough to buy a hundred dollars worth of groceries."
Usage: Do not use "hundred" to refer to a single banknote; instead, use it only when counting multiple notes of that denomination, such as "a stack of hundreds." The word represents the quantity of one hundred units rather than the physical object itself.
being ten more than ninety
"She counted exactly a hundred items to make sure she had reached ninety plus ten."
A numerical value equal to 100 (10²), occurring after ninety-nine.
"The clock struck a hundred when the final bell rang at school."
The word "hundred" comes from Old English and originally meant a group of one hundred items arranged in rows or lines for counting. It traveled into modern English unchanged from its ancient roots, where it was formed by combining a number word with a term for row.